Perhaps you should try some spelling variations:
"The commands exercises" » "The commands exercise", "The comments exercises", "The command exercise"
"The compass exercises" » "The company exercises", "The class exercises", "The comyns exercises"
"the complex series" » "the complex services", "the complex queries", "the complete series"

Try widening your search to All Fields.

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: (((("The compass exercises") OR ("The commands exercises"))) OR ("the complex series")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"The compass exercises\") OR (\"The commands exercises\"))) or (\"the complex series\"))".
• Removing quotes may allow a broader search: (((( The compass exercises ) OR ( The commands exercises ))) or ( the complex series )).
• Adding a wildcard symbol may retrieve word variants: (((("The compass exercises") OR ("The commands exercises"))) or ("the complex series"))*.