Perhaps you should try some spelling variations:
"_ colonization history" » "_ communication history", "_ organization history", "_ cooperation history", "_ decolonization history", "decolonization _ history"
"lea's organization theory" » "learning organization theory", "women's organizations theory"
"world federation history" » "world migration history", "road federation history", "world education 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: "((\"lea's organization theory\") OR (((\"_ colonization history\") OR (\"world federation history\"))))~".
• Removing quotes may allow a broader search: (( lea's organization theory ) OR ((( _ colonization history ) OR ( world federation history ))))~.
• Adding a wildcard symbol may retrieve word variants: (("lea's organization theory") OR ((("_ colonization history") OR ("world federation history"))))*.