problem with multiselect listbox

F

Forza MIlan

Hi, my English is not good enough, but i hope someone can will understand
my question and help me.
I changed my "combo box" to a "list box" in my Form, because i want to
select more than one option, everything is fine but when i start the query
there is no data there ( blank chart ). I read some answers about this but i
could't solve the problem. I sholud write a vba code, but don't know the
code.
Hope someone could help me :))
 
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