Perhaps you should try some spelling variations:
communication history » telecommunication history, communication sector, communication theory
cooperation implies » cooperation series, cooperation studies, cooperation civility
colonization songs » colonization still, colonization work, decolonization notes
early cooperation » early operation, early cooperative, energy cooperation
mars colonization » mrsa colonization, its colonization, jews colonization
pro communication » prone communication, ngo communication, proper communication

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((( early cooperation implies ) or ( mars colonization songs ))) or ( pro communication history ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( early cooperation implies ) OR ( mars colonization songs ))) OR ( pro communication history )).
• Adding a wildcard symbol may retrieve word variants: (((( early cooperation implies ) or ( mars colonization songs ))) or ( pro communication history ))*.