For a strict search [Strict search], place an exclamation mark (!) at the end of the desired term.
Condition: The result may only contain what was entered (apart from spaces or a separator such as a period). The strict search [Strict search] tolerates stemming[5].
For performance reasons, you may only perform the strict search [Strict search] as a variable search (e.g. MAT=copper).
MAT=copper
for example, also finds "Rivet: copper, mandrel: phosphated steel".
If you only want to find "copper", use the strict search [Strict search].
MAT=Copper !
If, on the other hand, you only want hits with "Rivet: copper, mandrel: phosphated steel", e.g. you want to exclude hits with "copper" alone, then combine phrase search and strict search [Strict search].
MAT="Rivet: copper, mandrel: steel phosphated"!