Perhaps you should try some spelling variations:
"city cooperation history" » "city corporation history", "city federation history", "china cooperation history", "city corporations history"
"jews colonization israel" » "jews communication israel", "jews colonization still", "jews colonization history", "its colonization israel", "mars colonization israel", "re colonization israel"
"data communication iraq" » "data communications iraq", "data communication iran", "data communication israel", "data communication italy"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("data communication iraq") or ("jews colonization israel"))) or ("city cooperation history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("data communication iraq") OR ("jews colonization israel"))) OR ("city cooperation history"))*.
• Removing quotes may allow a broader search: (((( data communication iraq ) or ( jews colonization israel ))) or ( city cooperation history ))*.