In the "erweiterten Suche", you can search for parameters such as "Starts, "Includes", Ends", and "Limitations".
In this example elements are searched, whose fields Starts and Includes contain either the words "unpack and backrest" or "parts and screw".
In this example elements are searched, whose fields Starts and Includes contain the words "unpack and backrest" and whose limitations does not contain the word "pen".