Perhaps you should try some spelling variations:
"its cooperation theories" » "its cooperation series", "its cooperation theory", "its collaboration theories", "city cooperation theories", "et cooperation theories", "its corporation theories"
"mars colonization failed" » "mars colonization still", "mars organizations failed", "mrsa colonization failed", "its colonization failed", "jews colonization failed"
"pro colonization songs" » "pro colonization still", "pro colonization work", "pro decolonization notes", "bio colonization songs", "re colonization songs", "mrsa colonization songs"

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: (((("its cooperation theories") or ("pro colonization songs"))) or ("mars colonization failed"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("its cooperation theories") OR ("pro colonization songs"))) OR ("mars colonization failed")).
• Removing quotes may allow a broader search: (((( its cooperation theories ) or ( pro colonization songs ))) or ( mars colonization failed )).
• Adding a wildcard symbol may retrieve word variants: (((("its cooperation theories") or ("pro colonization songs"))) or ("mars colonization failed"))*.