Perhaps you should try some spelling variations:
communication phase » communication case, communication based, communication paper
2.1 communication » 2.14 communication, 2.3 communication, 2.7 communication
die developpement » de developpement, le developpement, du developpement
innovation cross » innovation across, innovations across, innovation causes
developpement en » developpement et, developpement des, developpement de
technology 2 » technology _, technology 1, technology 3
price 2.1 » prices 2.1, price 2.3, rice 2.1
phase die » phase i, phase ii, phase iii

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

• Adding a wildcard symbol may retrieve word variants: technology 2 innovation cross price 2.1 communication phase die developpement en afrique.*.