SQL - search multiple strings

Hi Experts

I'm having some difficulty adding strings to an existing, functioning query.  It should read  where PP_Problem contains string1 or string 2 but i get syntax errors whichever way i try this.

PS using the word OR instead of a comma returns all the records without filtering any of the strings

Many thanks

Peter

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this works 
SQL = SQL & " where [PP_Problem] like '*String1*' "
 
this one doesn't 
SQL = SQL & " where [PP_Problem] like '*String1*' , '*String2*'"