Perhaps you should try some spelling variations:
informationen theory » information theory, informationen uber, deformation theory
irrigation system » irrigation systems, irrigation water, irrigation scheme
deep irrigation » drip irrigation, delta irrigation, level irrigation
support deep » supported deep, support de, support does
supply von » supply ann, supply donor

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply von informationen theory. ) or ( support deep irrigation system. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply von informationen theory. ) OR ( support deep irrigation system. )).
• Adding a wildcard symbol may retrieve word variants: (( supply von informationen theory. ) or ( support deep irrigation system. ))*.