Perhaps you should try some spelling variations:
"ngo communication issues" » "ngo community issues", "ngo communication india", "ngo communication united", "togo communications issues", "de communication issues", "3 communication issues"
"early cooperation series" » "early cooperation theories", "early cooperation sources", "early cooperation studies", "early operation series", "early cooperative series", "energy cooperation series"
"its colonization still" » "its colonization failed", "its colonization israel", "its colonization songs", "anti colonization still", "jews colonization still", "mars colonization still"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ngo communication issues\") OR (((\"early cooperation series\") OR (\"its colonization still\"))))~".
• Removing quotes may allow a broader search: (( ngo communication issues ) OR ((( early cooperation series ) OR ( its colonization still ))))~.
• Adding a wildcard symbol may retrieve word variants: (("ngo communication issues") OR ((("early cooperation series") OR ("its colonization still"))))*.