Perhaps you should try some spelling variations:
colonization history » communication history, organization history, civilization history
decolonization from » decolonisation from, decolonization africa, decolonization across
cooperation history » corporation history, federation history
re decolonization » _ decolonization, re colonization, box decolonization
pro cooperation » group cooperation, area cooperation, arab cooperation
_ colonization » _ decolonization, decolonization _

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: (((( re decolonization from ) OR ( _ colonization history ))) OR ( pro cooperation history ))~.
• Adding a wildcard symbol may retrieve word variants: (((( re decolonization from ) or ( _ colonization history ))) or ( pro cooperation history ))*.