Perhaps you should try some spelling variations:
personal communication » interpersonal communication
les developpement » le developpement, des developpements, leur developpement
developpement du » developpement de, developpement des, developpement et
der variation » de variation, does variation, die variation
du afrique » en afrique, l afrique, de l'afrique
4 its » 4 it's, _ its, 4 ito
2 its » _ its
a les » a lens, a less, 2 les
theorie » theories

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: "theorie der variation ((4 its) OR (2 its)) personal communication a les developpement du afrique.~".
• Adding a wildcard symbol may retrieve word variants: theorie der variation ((4 its) OR (2 its)) personal communication a les developpement du afrique.*.