Perhaps you should try some spelling variations:
"single-lens reflex camera / handbooks, manuals, etc" » "single-lens reflex cameras / handbooks, manuals, etc", "single-les reflex camera / handbooks, manuals, etc", "single-lens reflex camera / handbooks, manual, etc"
"single-less reflex camera / handbooks, manuals, etc" » "single-less reflex cameras / handbooks, manuals, etc", "single-bass reflex camera / handbooks, manuals, etc", "single-loops reflex camera / handbooks, manuals, etc", "single-less reflex camera / handbooks, manual, etc"
"single-versus reflex camera / handbooks, manuals, etc" » "single-versus reflex cameras / handbooks, manuals, etc", "single-versus reflexive camera / handbooks, manuals, etc", "single-versus refined camera / handbooks, manuals, etc", "single-versus refugee camera / handbooks, manuals, etc", "single-versus reflex camera / handbooks, manual, etc"

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: (("single-lens reflex camera / handbooks, manuals, etc") OR ((("single-less reflex camera / handbooks, manuals, etc") OR ("single-versus reflex camera / handbooks, manuals, etc")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"single-lens reflex camera / handbooks, manuals, etc\") or (((\"single-less reflex camera / handbooks, manuals, etc\") OR (\"single-versus reflex camera / handbooks, manuals, etc\"))))".
• Removing quotes may allow a broader search: (( single-lens reflex camera / handbooks, manuals, etc ) or ((( single-less reflex camera / handbooks, manuals, etc ) OR ( single-versus reflex camera / handbooks, manuals, etc )))).
• Adding a wildcard symbol may retrieve word variants: (("single-lens reflex camera / handbooks, manuals, etc") or ((("single-less reflex camera / handbooks, manuals, etc") OR ("single-versus reflex camera / handbooks, manuals, etc"))))*.