Perhaps you should try some spelling variations:
2.3 communication » 3.2 communication, de communication, 4 communication
developpement de » developpement des, developpement durable
technology code » technology case, technology cost, technology choice
existing effect » mediating effect, testing effect
code existing » co existing, some existing, models existing
effect from » effects from, expect from, effect firm
de afrique » de l'afrique, en afrique, l afrique
from 2.3 » from 2003, from 20, from 25

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

• Adding a wildcard symbol may retrieve word variants: technology code existing effect from 2.3 communication costs _ developpement de afrique.*.