Perhaps you should try some spelling variations:
15 communication » 5 communication, 1 communication, 10 communication
developpement de » developpement des, developpement durable
technology can » technology change, technology 1, technology 2.2
testing effect » teaching effect, herding effect, resulting effects
can testing » con testing, care testing, dnn testing
effect from » effects from, expect from, effect firm
from 15 » from 10

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

• Adding a wildcard symbol may retrieve word variants: technology can testing effect from 15 communication costs _ developpement de l'afrique.*.