Perhaps you should try some spelling variations:
3.2 communication » 3 communication, 2.3 communication, de communication
clean development » human development, urban development
development l » development li, development 1, development law
technology 2 » technology _, technology 1, technology 3
l afrique » en afrique
2 rice » _ rice, a rice, 9 rice
3 rice » _ rice, a rice

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: "technology 2 information ((2 rice) OR (3 rice)) 3.2 communication _ clean development l afrique.~".
• Adding a wildcard symbol may retrieve word variants: technology 2 information ((2 rice) OR (3 rice)) 3.2 communication _ clean development l afrique.*.