emmad,
I've pulled some information with a similar combination of tables. As pointed out previously, you will need to define how each of your tables relates to at least one other table in your list, like so:
SELECT
c.CY_CYCLE as Test_Set,
t.TS_NAME as Test_Name,
tc.TC_PLAN_SCHEDULING_DATE as Planned_Execution,
tc.TC_TESTER_NAME as Tester,
FROM TESTCYCL AS tc, Cycle AS c, Cycl_Fold AS cf,Test AS t, release_cycles AS rc
Where t.ts_test_id = tc.tc_test_id
AND cf.cf_item_id = c.cy_folder_id
AND tc.tc_cycle_id = c.cy_cycle_id
AND rc.rcyc_id = c.cy_cycle_id -- NOT SURE OF THIS RELATIONSHIP - YOU'LL HAVE TO VERIFY
AND rc.RCYC_ID = '38'