Perhaps you should try some spelling variations:
developpement il » developpement de, developpement et, developpement du
existing effect » mediating effect, testing effect
4 communication » 3 communication, 5.4 communication, de communication
technology 2 » technology _, technology 1, technology 3
effect firm » affect firms, effect first, effect from
2 existing » _ existing, 3 existing, pre existing
il afrique » l afrique, en afrique
firm 4 » firm _, firm 1, firm a

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

• Adding a wildcard symbol may retrieve word variants: technology 2 existing effect firm 4 communication costs _ developpement il afrique.*.