Perhaps you should try some spelling variations:
"_ decolonization history" » "_ colonization history", "_ decolonization islam", "_ decoration history", "decolonization _ history"
"de communication theory" » "de communication technology", "mobile communication theory", "online communication theory"
"re colonization israel" » "re communication israel", "re colonization still", "re colonization history", "pro colonization israel", "_ colonization israel", "jews colonization israel"

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

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