Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
trade developement » trade development, trade developments, trades development
formulacion who » formulacion de, formulation where
technologies a » technologies _, technologies 4, technologies 2
a formulacion » la formulacion, a formulation, la formulation
costs trade » costly trade
does data » does cat
who does » whom does, who goes, who loses

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

• Adding a wildcard symbol may retrieve word variants: technologies a formulacion who does data communications costs trade developement _ afrique.*.