Perhaps you should try some spelling variations:
verbal communication » nonverbal communication, virtual communication, oral communication
trade development » software development
variation using » variations during, variation und, variation among
typologien der » typologie der, typologie des, apologien der
development en » developpement en, development menu, development eco
der variation » de variation, does variation, die variation
des verbal » des verbalen, des verbs, models verbal
using des » using pdes, using aes, using dbs

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

• Adding a wildcard symbol may retrieve word variants: typologien der variation using des verbal communication a trade development en afrique.*.