Perhaps you should try some spelling variations:
oral communication » personal communication
developpement l » developpement il, developpement la, developpement de
typologien die » typologien der, typologie des, typologie der
die variation » de variation, does variation, der variation
does oral » does formal, does oil
l afrique » en afrique
1.1 ai » 1.1 aim, 2.1 ai, 1.1 aims
3.1 ai » 3.1 aim, 3.1 api, 2.1 ai

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 die variation _ does oral communication ((1.1 ai) OR (3.1 ai)) developpement l afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologien die variation _ does oral communication ((1.1 ai) OR (3.1 ai)) developpement l afrique.*.