Perhaps you should try some spelling variations:
personal communication » interpersonal communication
die developpement » de developpement, le developpement, du developpement
developpement de » developpement des, developpement durable
die personal » die personale, de personal, die persona
6 variables » 3 variables, 2 variables, d variables
variables 1 » variables _, variables 4, variables 3
typology 6 » typology _, typology 4.1
1 die » 2 die, 3 die

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

• Adding a wildcard symbol may retrieve word variants: typology 6 variables 1 die personal communication _ die developpement de l'afrique.*.