filter with keyword in memofield

[referee]

Hi all

on a mainform i have a text box
what i want to do is the following:
when i write a word in the textfield and afther update i want to filter the records in my subform
it must search in a memofield "FENOMEEN" on the subform called "frmSubTEST1"
The mainform called "test"
the subform is based on the query "qryall"
can someone help me wit a code please?

thanks

referee