Perhaps you should try some spelling variations:
"china cooperation history" » "china corporation history", "china federation history", "asian cooperation history", "regional cooperation history"
"its decolonization _" » "_ decolonization _", "box decolonization _", "war decolonization _", "its colonization _"
"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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("its decolonization _") or ("its colonization still"))) or ("china cooperation history"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("its decolonization _") OR ("its colonization still"))) OR ("china cooperation history")).
• Removing quotes may allow a broader search: (((( its decolonization _ ) or ( its colonization still ))) or ( china cooperation history )).
• Adding a wildcard symbol may retrieve word variants: (((("its decolonization _") or ("its colonization still"))) or ("china cooperation history"))*.