Perhaps you should try some spelling variations:
active communication » reactive communication, proactive communication, actions communication
technologies sector » technology sector, technologies series
sector population » vector populations, sector regulation, center population
population center » population census, population censuses, population change
4 developing » 3 developing
developing 1 » developing _, developing a, developing e
center und » inter und, bunter und
und active » und aktive, und enactive, under active
costs 4 » costs _, costs a, costs 4.2
1 areas » 1 area, 2 areas, 4 areas

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

• Adding a wildcard symbol may retrieve word variants: technologies sector population center und active communication costs 4 developing 1 areas.*.