Perhaps you should try some spelling variations:
persona communication » personal communication, personal communications, personal communicator
developpement en » developpement et, developpement des, developpement de
als variables » als variable, asset variables, angle variables
typology als » typology alma, typology a, typology _
die persona » die person, de persona, die personale
a du » a de, a u, _ du

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: "typology als variables _ die persona communication ((a du) OR (a d)) developpement en afrique.~".
• Adding a wildcard symbol may retrieve word variants: typology als variables _ die persona communication ((a du) OR (a d)) developpement en afrique.*.