Perhaps you should try some spelling variations:
developpement en » developpement et, developpement des, developpement de
4 communication » 3 communication, 5.4 communication, de communication
des variation » does variation, de variation, der variation
typology des » typologie des, typologie der, typology _
variation 6 » variation _, variations _, variation des
5 youth » _ youth, a youth, 1 youth
2 youth » _ youth, a youth
6 boe » 6 ioe
boe 4 » bot 4, box 4, ioe 4

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 des variation 6 boe 4 communication ((5 youth) OR (2 youth)) developpement en afrique.~".
• Adding a wildcard symbol may retrieve word variants: typology des variation 6 boe 4 communication ((5 youth) OR (2 youth)) developpement en afrique.*.