Perhaps you should try some spelling variations:
communication net » communication new, communication neil, communication needs
trade development » software development
formulation 4 » formulation _, formulation 3, formulation 2.4
development l » development li, development 1, development law
net trade » der trade
l afrique » en afrique
does 3 » does _, does a, does d
does e » does de, does _, does a

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: "technologies _ formulation 4 ((does 3) OR (does e)) communication net trade development l afrique.~".
• Adding a wildcard symbol may retrieve word variants: technologies _ formulation 4 ((does 3) OR (does e)) communication net trade development l afrique.*.