Perhaps you should try some spelling variations:
communication technological » communication technologies, communication technology, communications technologies
technological processes » biotechnological processes, ecological processes, technological promises
irrigation technology » information technology, production technology, education technology
technology congresses » sociology congresses

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( irrigation technology congresses. ) or ( communication technological processes. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( irrigation technology congresses. ) OR ( communication technological processes. )).
• Adding a wildcard symbol may retrieve word variants: (( irrigation technology congresses. ) or ( communication technological processes. ))*.