Perhaps you should try some spelling variations:
communications model » communications models, communication model, communicating model
clean development » human development, urban development
development l » development li, development 1, development law
model clean » model coleman, model can, model learn
safe data » mafe data, safety data, life data
l afrique » en afrique
gap safe » gap rate

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

• Performing a fuzzy search may retrieve terms with similar spellings: technologies _ information gap safe data communications model clean development l afrique.~.
• Adding a wildcard symbol may retrieve word variants: technologies _ information gap safe data communications model clean development l afrique.*.