Perhaps you should try some spelling variations:
net developpement » et developpement, de developpement, le developpement
developpement et » developpement des, developpement de, development east
variation des » variation _, variation 6, variation series
a variation » la variation, _ variation, 2 variation
et afrique » en afrique, l afrique
apology a » apology _, apology mea, typology a
dem power » der power, dc power, am power
den power » der power, down power, when power
a net » a new, _ net, a neo

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "apology a variation des ((dem power) OR (den power)) communication a net developpement et afrique.~".
• Adding a wildcard symbol may retrieve word variants: apology a variation des ((dem power) OR (den power)) communication a net developpement et afrique.*.