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 do » technology does, technology dlt, technology 1
do existing » co existing, _ existing, 2 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 do existing effect from 3.1 communication costs _ developpement il afrique.*.