Perhaps you should try some spelling variations:
persona communication » personal communication, personal communications, personal communicator
die developpement » de developpement, le developpement, du developpement
developpement de » developpement des, developpement durable
gamma variables » dummy variables, data variables, same variables
typology gamma » typology alma
variables 6 » variables _, variables 4, variables 3
die persona » die person, de persona, die personale
6 die » 2 die, 3 die, _ die
a die » 2 die, 3 die, _ 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 6 die persona communication a die developpement de l'afrique.*.