Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
data communication » data communications
trade development » software development
technology 4 » technology _, technology 1, technology 3
costly trade » costs trade, country trade, costly than
4 inflation » _ inflation, 2 inflation, 6 inflation
rate und » raten und, ate und, gerate und
und data » fund data, wind data, und daten

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

• Adding a wildcard symbol may retrieve word variants: technology 4 inflation rate und data communication costly trade development latin afrique.*.