Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
trade development » software development
back information » bank information, pack information, lack information
information gaps » information gap
technology back » technology book, technology stacks, technology based
costly trade » costs trade, country trade, costly than
gaps does » gaps notes, gaps do, guns does

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

• Adding a wildcard symbol may retrieve word variants: technology back information gaps does risk communication costly trade development _ afrique.*.