Perhaps you should try some spelling variations:
3.2 communication » 3 communication, 2.3 communication, de communication
old developpement » le developpement, ou developpement, de developpement
technology trade » technology trends, technology transfer, technology transfers
trade sector » care sector
sector wage » sector wages
efforts old » efforts role, effort gold, efforts acd
des afrique » en afrique, de l'afrique
wage race » wages race, wage rate, age race
race 3.2 » race 3.7, race 4.2, rice 3.2

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

• Adding a wildcard symbol may retrieve word variants: technology trade sector wage race 3.2 communication efforts old developpement des afrique.*.