Perhaps you should try some spelling variations:
china communications » china communication, china's communications, chile communications
communications 11 » communication 11, communications 1, communications 14
de developpement » sme development
developpement de » developpement des, developpement durable
der variation » de variation, does variation, die variation
3 gas » 2 gas
11 de » 11 die, 11 der, 11 des
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 ((3 gas) OR (_ gas)) china communications 11 de developpement de l'afrique.~".
• Adding a wildcard symbol may retrieve word variants: theorie der variation ((3 gas) OR (_ gas)) china communications 11 de developpement de l'afrique.*.