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

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) OR (supply ann)) informationen theory. ) or ( support deep irrigation water. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((supply von) OR (supply ann)) informationen theory. ) OR ( support deep irrigation water. )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((supply von) OR (supply ann)) informationen theory. ) or ( support deep irrigation water. ))".
• Adding a wildcard symbol may retrieve word variants: (( ((supply von) OR (supply ann)) informationen theory. ) or ( support deep irrigation water. ))*.