here’s my table:

and I want get the customers which have some values of for/category fields which is comma separated..
I am trying something like this:
SELECT * FROM `customers` WHERE `for` LIKE ('%AMC PHD & WWS%' OR '%Rostfrei%' OR '%Thermopac%')
but its giving empty result.
RedFilter’s SQL is correct, but you should also know that “for” is a MySQL reserved word. You should avoid using it as a column name, or wrap it in backticks when you use it:
The alternative, typing the column name once is: