Perhaps you should try some spelling variations:
"its cooperation studies" » "its cooperation series", "its cooperation sources", "its cooperation implies", "city cooperation studies", "et cooperation studies", "its corporation studies"
"its cooperation history" » "its corporation history", "its federation history", "city cooperation history", "et cooperation history"
"jews colonization songs" » "jews colonization still", "jews colonization work", "jews decolonization notes", "its colonization songs", "mars colonization songs", "re colonization songs"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("jews colonization songs") or ("its cooperation studies"))) or ("its cooperation history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("jews colonization songs") OR ("its cooperation studies"))) OR ("its cooperation history"))*.
• Removing quotes may allow a broader search: (((( jews colonization songs ) or ( its cooperation studies ))) or ( its cooperation history ))*.