Perhaps you should try some spelling variations:
3.5 communication » 3.2 communication, 3 communication, 2.3 communication
technology trade » technology trends, technology transfer, technology transfers
trade electronic » train electronics, fake electronic, guide electronic
developpement de » developpement des, developpement durable
4 developpement » de developpement, le developpement, et developpement
electronic age » electronic games, electronic data, electronic mail
de afrique » de l'afrique, en afrique, l afrique
age race » wages race, age range, cane race
race 3.5 » races 3.5, race 1.5, race 3.7
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology trade electronic age race 3.5 communication costs 4 developpement de afrique.*.