Perhaps you should try some spelling variations:
personal communication » interpersonal communication
saline irrigation » saving irrigation, scale irrigation, basin irrigation
des developpement » des developpements, de developpement, le developpement
typologie saline » typologie eines
developpement en » developpement et, developpement des, developpement de
communication 2 » communication _, communication a, communication 3
irrigation 5 » irrigation _, irrigation 4, irrigation use
era personal » a personal, der personal, e personal
5 era » _ era, 0 era, 5 erp
2 des » 2 der, 2 das, a des

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

• Adding a wildcard symbol may retrieve word variants: typologie saline irrigation 5 era personal communication 2 des developpement en afrique.*.