Perhaps you should try some spelling variations:
"pro dollarization ratios" » "pro dollarization brazil", "pro dollarization causes", "pro dollarization its", "_ dollarization ratios", "de dollarization ratios", "2 dollarization ratios"
"its cooperation studies" » "its cooperation series", "its cooperation sources", "its cooperation implies", "city cooperation studies", "et cooperation studies", "its corporation studies"
"its colonization failed" » "its colonization still", "its organizations failed", "anti colonization failed", "jews colonization failed", "mars colonization failed"

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