Perhaps you should try some spelling variations:
2.1.1 communication » 2.3.1.1 communication, 2.2.3 communication, 2.14 communication
de developpement » sme development
developpement en » developpement et, developpement des, developpement de
communication 3 » communication _, communication a
technology use » technology 1, technology 2.2, technology 3
section rates » reaction rates, infection rates, insertion rates
use section » use sector, use reduction, care section
rates rules » rate rules, gats rules, rates rates
rules 2.1.1 » rules 2.1.3, rules 2.1.5, rules 2.1.6
3 de » 3 die, 3 der, 3 des

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

• Adding a wildcard symbol may retrieve word variants: technology use section rates rules 2.1.1 communication 3 de developpement en afrique.*.