Perhaps you should try some spelling variations:
oral communication » personal communication
die developpement » de developpement, le developpement, du developpement
minor irrigation » micro irrigation, minor variation, runoff irrigation
developpement en » developpement et, developpement des, developpement de
typologie minor » typologie eines, typologie einiger
communication 3 » communication _, communication a
irrigation 6 » irrigation _, irrigation 4, irrigation 5
hr oral » who oral, why oral
3 die » 2 die, _ die
6 hr » 6 hrm, 6 ihr, _ hr

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

• Adding a wildcard symbol may retrieve word variants: typologie minor irrigation 6 hr oral communication 3 die developpement en afrique.*.