Perhaps you should try some spelling variations:
power development » water development, career development, hydropower development
communication 5 » communication _, communication a, communication 3
development en » developpement en, development menu, development eco
variation did » variation des, variation der, variation im
de variation » der variation, die variation, does variation
typology de » typology _, typology 6, typology a
5 power » 2 power, 3 power, 4 power
sos 4 » qos 4, sds 4, ses 4
so 4 » soe 4, so _, o 4

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: "typology de variation did ((so 4) OR (sos 4)) communication 5 power development en afrique.~".
• Adding a wildcard symbol may retrieve word variants: typology de variation did ((so 4) OR (sos 4)) communication 5 power development en afrique.*.