Perhaps you should try some spelling variations:
"_ decolonization history" » "_ colonization history", "_ decolonization islam", "_ decoration history", "decolonization _ history"
"de communication history" » "de telecommunication history", "de communication sector", "de communication theory", "mobile communication history", "online communication history"
"its colonization failed" » "its colonization still", "its organizations failed", "anti colonization failed", "jews colonization failed", "mars colonization failed"

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 colonization failed") OR ("_ decolonization history"))) OR ("de communication history"))~.
• Removing quotes may allow a broader search: (((( its colonization failed ) or ( _ decolonization history ))) or ( de communication history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("its colonization failed") or ("_ decolonization history"))) or ("de communication history"))*.