Perhaps you should try some spelling variations:
communications non » communications can, communications en, communications from
trade development » software development
typologies 6.3 » typologies 2.3, typologie 1.3, typologies 2.5
development de » development d, development ds, developpement de
6.3 variation » 3.3 variation, 6.4 variation, 1.3 variation
timss data » time data
de afrique » de l'afrique, en afrique, l afrique

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

• Adding a wildcard symbol may retrieve word variants: typologies 6.3 variation _ timss data communications non trade development de afrique.*.