i tried out with the following
TAB1
======
Id, Col1
----------
1, A
2, B C
3, A B
4, D E
5, F A G
TAB2
======
Col1
-----
A
this is the result
SQL> SELECT * FROM TAB1, TAB2
2 WHERE TAB1.col1 LIKE '%'||TAB2.col1||'%'
3 /
ID COL1 COL1
---------- ---------- ----------
1 A A
3 A B A
5 F A G A
Elapsed: 00:00:00.00
SQL>
looks like its working fine