Perhaps you should try some spelling variations:
leur developpement » le developpement, deux developpements, de developpement
mask communication » mass communication, mass communications, risk communication
developpement en » developpement et, developpement des, developpement de
1.2 integration » 2.2 integration, 3.2 integration, 5.2 integration
technology 1.2 » technology 2.2, technology 3.2, technology 1.1
costs leur » costs clear
face mask » face masks, face case

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

• Adding a wildcard symbol may retrieve word variants: technology 1.2 integration _ face mask communication costs leur developpement en afrique.*.