Perhaps you should try some spelling variations:
causes communication » mass communication, crisis communication, assess communication
trade development » software development
technology set » technology sector, technology 1, technology 2.2
relative food » operative food, relative role, relative crop
prices causes » prices cases, crises causes, crisis causes
set relative » der relative, key relative, sog relative
costs trade » costly trade
china data » china update, chinese data

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

• Adding a wildcard symbol may retrieve word variants: technology set relative food prices causes communication costs trade development china data.*.