Perhaps you should try some spelling variations:
3.1 communication » 3.1 communications, 3.2 communication, 3.5 communication
developpement il » developpement de, developpement et, developpement du
existing effect » mediating effect, testing effect
technology co » technology cost, technology code, technology can
co existing » _ existing, 2 existing, 3 existing
effect from » effects from, expect from, effect firm
il afrique » l afrique, en afrique
from 3.1 » from 1.1b, from 9.14, strom 3.1

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

• Adding a wildcard symbol may retrieve word variants: technology co existing effect from 3.1 communication costs _ developpement il afrique.*.