In order to perform a Strict search, at the end of the desired term, put an exclamation mark (!).
Condition: In the result, only that is tolerated what has been entered (apart from empty spaces or a separator like a point for example). The Strict search tolerates stemming[141].
Due to performance reasons, possibly perform the Strict search only as variable search (like e.g. MAT=copper).
MAT=Kupfer
for example, also finds"Niete: Kupfer, Dorn: Stahl phosphatiert".
If you only want to find "Kupfer" exclusively, use the Strict search.
MAT=Kupfer!
However, if you only want to find "Niete: Kupfer, Dorn: Stahl phosphatiert", meaning to exclude results with only "Kupfer", then combine Phrase search and Strict search.
MAT="Niete: Kupfer, Dorn: Stahl phosphatiert"!

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