Perhaps you should try some spelling variations:
china's transport » africa's transport, india's transport
fourth transport » port transport, rural transport, dots transport
debatten fourth » debate fourth
2.1 debatten » 2.1 debate, 9.2 debatten, 3.2.6 debatten
demand cacao » demand case, demand data, demand local
costs cao » costs case, costs cash, costs chap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( 2.1 debatten fourth transport costs cao ) OR ( luis _ china's transport demand cacao ))~.
• Adding a wildcard symbol may retrieve word variants: (( 2.1 debatten fourth transport costs cao ) or ( luis _ china's transport demand cacao ))*.