Perhaps you should try some spelling variations:
tests interaction » results interaction, cases interaction, depth interaction
3.1 communication » 3.1 communications, 3.2 communication, 3.5 communication
technology tests » technology thesis, technology best, technology costs
interaction term » interaction _
developpement de » developpement des, developpement durable
4 developpement » de developpement, le developpement, et developpement
term prices » term price, term process, farm prices
prices 3.1 » prices 2.1, prices 3.2, prices 2.3.1
de afrique » de l'afrique, en afrique, l afrique
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology tests interaction term prices 3.1 communication costs 4 developpement de afrique.*.