Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
trade development » software development
de communication » mobile communication, online communication
technology user » technology users, technology use, technology used
user innovation » der innovation, serie innovation, gender innovation
innovation 2 » innovation 1, innovation 4, innovation 3
costly trade » costs trade, country trade, costly than
africa era » africa eiu, africa eu, africa en
die de » die die, die der, die den

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

• Adding a wildcard symbol may retrieve word variants: technology user innovation 2 die de communication costly trade development africa era.*.