Perhaps you should try some spelling variations:
"a fifty-minute period back" » "a fifty-minute version back", "a fifty-acute period back", "a fifty-minute per back", "a fifty-minute period batch", "a fifty-minute period book", "a fifty-minute period based"
"a fifty-minute period black" » "a fifty-minute version black", "a fifty-acute period black", "a fifty-minute per black", "a fifty-minute period batch", "a fifty-minute period beata", "a fifty-minute period beate"
"_ fifty-minute period bart" » "_ fifty-minute version bart", "_ fifty-acute period bart", "_ fifty-minute per bart", "_ fifty-minute period part", "_ fifty-minute period art", "_ fifty-minute period birth"
"a fifty-minute series book" » "a fifty-minute review book", "a fifty-minute prices book", "a fifty-minute survey book", "a fifty-minute series books", "a fifty-minute services book", "a fifty-minute stories book"
"a fifth-minute series block" » "a fifth-minute review block", "a fifth-minute prices block", "a fifth-minute survey block", "a fifth-minute series black", "a fifth-minute servers block", "a fifth-minute stripes block"
"_ fifth-minute series block" » "_ fifth-minute review block", "_ fifth-minute prices block", "_ fifth-minute survey block", "_ fifth-minute series black", "_ fifth-minute servers block", "_ fifth-minute stripes block"
"a fifty-minute series stock" » "a fifty-minute review stock", "a fifty-minute prices stock", "a fifty-minute survey stock", "a fifty-minute services stock", "a fifty-minute series stops", "a fifty-minute fisheries stock"
"a fifty-minute series back" » "a fifty-minute review back", "a fifty-minute prices back", "a fifty-minute survey back", "a fifty-minute services back", "a fifty-minute series basics", "a fifty-minute series based"
"a fifty-minute bodies block" » "a fifty-finite bodies block", "a fifty-minute books block", "a fifty-minute bodies black", "a fifty-minute bodies back", "a fifty-minute bodies stock"
"a fifty-minute bodies locke" » "a fifty-finite bodies locke", "a fifty-minute books locke", "a fifty-minute bodies like", "a fifty-minute bodies local", "a fifty-minute hobbes locke"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("a fifty-minute series book") OR ((((((((("a fifth-minute series block") OR ("_ fifth-minute series block"))) OR ((("a fifty-minute bodies block") OR ("a fifty-minute bodies locke"))))) OR ("a fifty-minute series stock"))) OR ((("a fifty-minute series back") OR ((((("a fifty-minute period back") OR ("a fifty-minute period black"))) OR ("_ fifty-minute period bart")))))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"a fifty-minute series book\") or (((((((((\"a fifth-minute series block\") OR (\"_ fifth-minute series block\"))) or (((\"a fifty-minute bodies block\") or (\"a fifty-minute bodies locke\"))))) or (\"a fifty-minute series stock\"))) or (((\"a fifty-minute series back\") or (((((\"a fifty-minute period back\") or (\"a fifty-minute period black\"))) or (\"_ fifty-minute period bart\"))))))))".
• Removing quotes may allow a broader search: (( a fifty-minute series book ) or ((((((((( a fifth-minute series block ) OR ( _ fifth-minute series block ))) or ((( a fifty-minute bodies block ) or ( a fifty-minute bodies locke ))))) or ( a fifty-minute series stock ))) or ((( a fifty-minute series back ) or ((((( a fifty-minute period back ) or ( a fifty-minute period black ))) or ( _ fifty-minute period bart )))))))).
• Adding a wildcard symbol may retrieve word variants: (("a fifty-minute series book") or ((((((((("a fifth-minute series block") OR ("_ fifth-minute series block"))) or ((("a fifty-minute bodies block") or ("a fifty-minute bodies locke"))))) or ("a fifty-minute series stock"))) or ((("a fifty-minute series back") or ((((("a fifty-minute period back") or ("a fifty-minute period black"))) or ("_ fifty-minute period bart"))))))))*.