Perhaps you should try some spelling variations:
die communication » de communication, time communication, une communication
developpement en » developpement et, developpement des, developpement de
relative states » relative wages, volatile states, relative clauses
based relative » case relative, based reflective, based receptive
states trade » states state, states three
trade die » trade date, trade does, trade day

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

• Adding a wildcard symbol may retrieve word variants: technology based relative states trade die communication costs _ developpement en afrique.*.