Perhaps you should try some spelling variations:
oral communication » personal communication
die developpement » de developpement, le developpement, du developpement
eines irrigation » minor irrigation, petite irrigation, saline irrigation
developpement en » developpement et, developpement des, developpement de
typologie eines » typologie cices, typologie einiger, typologie des
communication 3 » communication _, communication a
6 hrm » _ hrm, e hrm
3 die » 2 die, _ die
6 hr » 6 ihr, _ hr, 6 mr

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 eines irrigation ((6 hr) OR (6 hrm)) oral communication 3 die developpement en afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologie eines irrigation ((6 hr) OR (6 hrm)) oral communication 3 die developpement en afrique.*.