If either of two cells contain a specific value, return another value
You can do this with an IF and OR, or two IF statements.
=IF( OR(A1="text value1";B1="text value1") ;C1;"")
or
=IF(A1="text value 1";C1;IF(B1="text value 1";C1;""))
The difference here is that the 1st one will result empty if both have text value 1, where the 2nd will always return C1 if either or both of them have this text.
You could also try the formula =IF(COUNTIF(A1:B1,"*text value 1*")>0,C1).
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To replace "False" with 0, you could use the formula =IF(COUNTIF(A1:B1,"*Mast*")>0,C1,0).