Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
trade development » software development
technology used » technology use, technology based, technology users
used innovation » user innovation, use innovation, based innovation
innovation 3 » innovation 1, innovation 4
costs trade » costly trade
re 10 » ke 10, re 1
de 10 » die 10, de 1, do 10

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: "technology used innovation 3 ((re 10) OR (de 10)) communications costs trade development africa _.~".
• Adding a wildcard symbol may retrieve word variants: technology used innovation 3 ((re 10) OR (de 10)) communications costs trade development africa _.*.