Perhaps you should try some spelling variations:
development case » development china
e communication » de communication, 1 communication, une communication
technologie 8 » technologien 8, technologie c, technologie 3
informal gold » informal food, informal should, informal group
case africa » cases africa, care africa, curse africa
8 informal » _ informal, 3 informal, vs informal
gold does » god does, good does, food does
3 clean » _ clean, a clean, 4 clean
6 clean » _ clean, a clean
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: "technologie 8 informal gold does e communication ((3 clean) OR (6 clean)) development case africa.~".
• Adding a wildcard symbol may retrieve word variants: technologie 8 informal gold does e communication ((3 clean) OR (6 clean)) development case africa.*.