Perhaps you should try some spelling variations:
"c's communication issues" » "c's community issues", "c's communication india", "c's communication united", "lea's communication issues", "class communication issues", "mass communication issues"
"mars colonization israel" » "mars communication israel", "mars colonization still", "mars colonization history", "mrsa colonization israel", "its colonization israel", "jews colonization israel"
"early cooperation still" » "early operation still", "early cooperative still", "energy cooperation still", "early cooperation scale", "early cooperation state", "early cooperation studies"

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: (((("mars colonization israel") or ("c's communication issues"))) or ("early cooperation still"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("mars colonization israel") OR ("c's communication issues"))) OR ("early cooperation still")).
• Removing quotes may allow a broader search: (((( mars colonization israel ) or ( c's communication issues ))) or ( early cooperation still )).
• Adding a wildcard symbol may retrieve word variants: (((("mars colonization israel") or ("c's communication issues"))) or ("early cooperation still"))*.