Perhaps you should try some spelling variations:
technologies challenges » technological challenges, technology challenges, techniques challenges
challenges oration » challenges operations, challenges section, challenges options
oral communication » personal communication
leur developpement » le developpement, deux developpements, de developpement
developpement l » developpement il, developpement la, developpement de
oration 1.2 » oration 12, formation 1.2, location 1.2
l afrique » en afrique
a oral » _ oral, 2 oral, 4 oral
1.2 a » 1.2 _, 2.2 a, 3.2 a

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

• Adding a wildcard symbol may retrieve word variants: technologies challenges oration 1.2 a oral communication a leur developpement l afrique.*.