Perhaps you should try some spelling variations:
communication 7.2.1 » communication 8.2.1, communication 3.2.1, communication 4.2.1
oral communication » personal communication
le developpement » de developpement, sme development
developpement de » developpement des, developpement durable
variation among » starvation among, formation among, variation von
typologien die » typologien der, typologie des, typologie der
die variation » de variation, does variation, der variation
among does » among boys, among les, among donors
de afrique » de l'afrique, en afrique, l afrique
does oral » does formal, does oil
7.2.1 le » 7.2.1 die, 7.2.1 _, 7.2.1 a

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• Adding a wildcard symbol may retrieve word variants: typologien die variation among does oral communication 7.2.1 le developpement de afrique.*.