Perhaps you should try some spelling variations:
persona communication » personal communication, personal communications, personal communicator
die developpement » de developpement, le developpement, du developpement
developpement en » developpement et, developpement des, developpement de
gamma variables » dummy variables, data variables, same variables
typology gamma » typology alma
die persona » die person, de persona, die personale
a die » 2 die, 3 die, 1 die

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

• Adding a wildcard symbol may retrieve word variants: typology gamma variables _ die persona communication a die developpement en afrique.*.