Perhaps you should try some spelling variations:
"_ decolonization from" » "_ decolonisation from", "_ decolonization africa", "_ decolonization across"
"its colonization still" » "its colonization failed", "its colonization israel", "its colonization songs", "anti colonization still", "jews colonization still", "mars colonization still"
"china federation history" » "china migration history", "chicago federation history", "china cooperation history", "china integration history"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"_ decolonization from\") OR (\"its colonization still\"))) OR (\"china federation history\"))~".
• Removing quotes may allow a broader search: (((( _ decolonization from ) OR ( its colonization still ))) OR ( china federation history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("_ decolonization from") OR ("its colonization still"))) OR ("china federation history"))*.