Perhaps you should try some spelling variations:
world pioneers » early pioneers, women pioneers, field pioneers
alias jackson » alias jack, brian jackson, miss jackson
world powers » world power, world papers, world poverty
jackson aid » jackson a, jackson b.d, jackson d

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: "2008 how ((world powers) OR (world pioneers)) alias jackson aid*".