Perhaps you should try some spelling variations:
china's communications » china communications, china communication, crisis communications
navigation services » sanitation services, information services
communications 3.3 » communication 3.3, communications 3.4, communications 4.3
port development » export development, airport development, forest development
der navigation » air navigation, der navigator, river navigation
3.3 china's » 3.13 china's, 1.3 china's, 3.1 china's
3.3 port » 3.3 post, 3.3 part, 3.3 por
theorie » theories

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

• Adding a wildcard symbol may retrieve word variants: theorie der navigation services 3.3 china's communications 3.3 port development 1 africa.*.