Perhaps you should try some spelling variations:
oral communication » personal communication
bet development » set development, test development, next development
typologien der » typologie der, typologie des, apologien der
development en » developpement en, development menu, development eco
der variation » de variation, does variation, die variation
variation des » variation _, variation 6, variation series
firm oral » firm rural
des firm » des firmes, des films, des filme
a bet » a best, a bent, a beta

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

• Adding a wildcard symbol may retrieve word variants: typologien der variation des firm oral communication a bet development en afrique.*.