Perhaps you should try some spelling variations:
oral communication » personal communication
development de » development d, development ds, developpement de
variation des » variation _, variation 6, variation series
typologie de » typologie des, typologie der, typologien der
de variation » der variation, die variation, does variation
de afrique » de l'afrique, en afrique, l afrique
u.s oral » u.s oil
des u.s » des us, der u.s
a does » 4 does, 1 does, 3 does
2 does » 4 does

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "typologie de variation des u.s oral communication ((a does) OR (2 does)) development de afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie de variation des u.s oral communication ((a does) OR (2 does)) development de afrique.*.