Perhaps you should try some spelling variations:
communication costly » communication costs, communication costa, communications costs
den communication » open communication, lean communication, when communication
than development » chain development, town development, plan development
technology user » technology users, technology use, technology used
user innovation » der innovation, serie innovation, gender innovation
costly than » costly trade
africa era » africa eiu, africa eu, africa en
die den » die der, die daten

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

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