Perhaps you should try some spelling variations:
1.4 communication » 5.4 communication, 1.1 communication, 1.3 communication
das developpement » des developpements, de developpement, du developpement
communication 3 » communication _, communication a
infection data » infection rate, infection rates, section data
sources 1.4 » sources 10.4, sources 13.4, sources 1.1
des afrique » en afrique, de l'afrique
3 das » 1 das, 2 das

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

• Adding a wildcard symbol may retrieve word variants: technology _ infection data sources 1.4 communication 3 das developpement des afrique.*.