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
development en » developpement en, development menu, development eco
typologies de » typologien der, typologies _, typologie des
de variation » der variation, die variation, does 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: typologies de variation using des verbal communication a trade development en afrique.*.