Perhaps you should try some spelling variations:
communication phase » communication case, communication based, communication paper
2.2 communication » 2.3 communication, 3.2 communication, 2.7 communication
interaction term » interaction _
la developpement » le developpement, de developpement, et developpement
developpement de » developpement des, developpement durable
3 interaction » 2 interaction, 3.2 interaction, 3.1 interaction
technology 3 » technology _, technology 1, technology 4
de afrique » de l'afrique, en afrique, l afrique
trade 2.2 » trade 3.2, trade 4.1
phase la » phase lag, phase a, phase das

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

• Adding a wildcard symbol may retrieve word variants: technology 3 interaction term trade 2.2 communication phase la developpement de afrique.*.