Perhaps you should try some spelling variations:
oral communication » personal communication
trade developement » trade development, trade developments, trades development
communication et » communication 3, communication 1, communication 2
typologien de » typologien der, typologie des, typologie der
de variation » der variation, die variation, does variation
et trade » net trade, pet trade, east trade
14 ex » 11 ex, 14 el
1 ex » 1 sex, 11 ex, _ ex

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: "typologien de variation ((1 ex) OR (14 ex)) oral communication et trade developement _ afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologien de variation ((1 ex) OR (14 ex)) oral communication et trade developement _ afrique.*.