Perhaps you should try some spelling variations:
navigation services » sanitation services, sanitation service, information services
irrigation schemes » irrigation scheme, irrigation systems
canal irrigation » scale irrigation
data navigation » water navigation, air navigation, data fabrication
supply canal » supply annual, supply rural, supply case
supply data » supply water

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply data navigation services. ) or ( supply canal irrigation schemes. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply data navigation services. ) OR ( supply canal irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (( supply data navigation services. ) or ( supply canal irrigation schemes. ))*.