Perhaps you should try some spelling variations:
technology volume » technologies volume, seismology volume, technology evolution
au developpement » du developpement, de developpement, le developpement
developpement l » developpement il, developpement la, developpement de
volume 7a » volume 7, volume 3a, volume 7b
l afrique » en afrique
costs au » costs a, costs amy, costs _
7a rate » a rate, pay rate, gap rate
case de » case des, case d1, case d2
case d » case 1, case 2, case 3

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 volume 7a rate ((case de) OR (case d)) communication costs au developpement l afrique.~".
• Adding a wildcard symbol may retrieve word variants: technology volume 7a rate ((case de) OR (case d)) communication costs au developpement l afrique.*.