Perhaps you should try some spelling variations:
"_ decolonization failed" » "_ colonization failed", "_ decolonization case", "_ decolonization africa", "decolonization _ failed"
"its decolonization islam" » "its decolonization from", "its decolonization _", "its colonization israel", "its colonization islam", "box decolonization islam", "war decolonization islam"
"its federation history" » "its migration history", "les federations history", "_ federation history", "3 federation 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: "((((\"its decolonization islam\") OR (\"_ decolonization failed\"))) OR (\"its federation history\"))~".
• Removing quotes may allow a broader search: (((( its decolonization islam ) OR ( _ decolonization failed ))) OR ( its federation history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("its decolonization islam") OR ("_ decolonization failed"))) OR ("its federation history"))*.