Perhaps you should try some spelling variations:
population measures » population pressures, pollution measures, population pressure
3.2 communication » 3 communication, 2.3 communication, de communication
7.3 developing » 3.3 developing, 1.3 developing, 2.2 developing
technology 1 » technology _
1 population » 2 population, 4 population, 2.1 population
annex 3.2 » annex 3.1, annex 2, annex 3a
costs 7.3 » costs 2.3, costs 4.3, costs 5.3

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

• Adding a wildcard symbol may retrieve word variants: technology 1 population measures annex 3.2 communication costs 7.3 developing _ african.*.