Perhaps you should try some spelling variations:
"library materials -- conservation OR conversation and restoration -- handbooks, manuals, etc." » "library materials -- conservation OR conversation and restoration -- handbook, manuals, etc."
"library materials -- conservation OR conversation and registration -- handbooks, manuals, etc." » "library materials -- conservation OR conversation and registration -- handbook, manuals, etc.", "library materials -- conservation OR conversation and legislation -- handbooks, manuals, etc."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("library materials -- (conservation OR conversation) and restoration -- handbooks, manuals, etc.") or ("library materials -- (conservation OR conversation) and registration -- handbooks, manuals, etc."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("library materials -- (conservation OR conversation) and restoration -- handbooks, manuals, etc.") OR ("library materials -- (conservation OR conversation) and registration -- handbooks, manuals, etc.")).
• Removing quotes may allow a broader search: (( library materials -- (conservation OR conversation) and restoration -- handbooks, manuals, etc. ) or ( library materials -- (conservation OR conversation) and registration -- handbooks, manuals, etc. )).
• Adding a wildcard symbol may retrieve word variants: (("library materials -- (conservation OR conversation) and restoration -- handbooks, manuals, etc.") or ("library materials -- (conservation OR conversation) and registration -- handbooks, manuals, etc."))*.

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