Perhaps you should try some spelling variations:
oral communication » personal communication
development manuel » developpement manuel, development model, development master
dams development » dam development, gas development, ads development
typologie der » typologie des, ideologie der
der variation » de variation, does variation, die variation
variation des » variation _, variation 6, variation series
eg oral » new oral

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

• Adding a wildcard symbol may retrieve word variants: typologie der variation des eg oral communication _ dams development manuel afrique.*.