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

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

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