Perhaps you should try some spelling variations:
oral communication » personal communication
developpement de » developpement des, developpement durable
information 2.1 » information 12.1, information 2.2, information 2.7
a developpement » au developpement, de developpement, le developpement
debatten oral » debatten om, debate moral, debatten das
2.1 debatten » 2.1 debate, 9.2 debatten, 3.2.6 debatten
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technology _ information 2.1 debatten oral communication costs a developpement de l'afrique.*.