Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
den communication » open communication, lean communication, when communication
trade development » software development
technology user » technology users, technology use, technology used
user innovation » der innovation, serie innovation, gender innovation
innovation 1 » innovation _, innovation a
costly trade » costs trade, country trade, costly than
africa era » africa eiu, africa eu, africa en
die den » die der, die daten
1 die » 2 die, 3 die, _ die

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

• Adding a wildcard symbol may retrieve word variants: technology user innovation 1 die den communication costly trade development africa era.*.