Perhaps you should try some spelling variations:
"cooperatives" » "cooperative", "cooperations", "comparative"
"conservations" » "conservation", "observations", "considerations"
"conversations" » "conversational", "conversion"
"condensation" » "concentration", "conservation", "convention"
"conservative" » "conservation", "consecutive", "cooperative"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("cooperatives" or ("conservations" or ("conversations" OR "condensation"))) or "conservative")~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cooperatives" OR ("conservations" OR ("conversations" OR "condensation"))) OR "conservative").
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cooperatives\" or (\"conservations\" or (\"conversations\" OR \"condensation\"))) or \"conservative\")".
• Removing quotes may allow a broader search: (( cooperatives or ( conservations or ( conversations OR condensation ))) or conservative ).
• Adding a wildcard symbol may retrieve word variants: (("cooperatives" or ("conservations" or ("conversations" OR "condensation"))) or "conservative")*.