Your question (or English) was a bit vague, but here goes:
If you want just c_3 and c_13's returned
SELECT id,condition_id,property_id
FROM table
WHERE condition_id = 'c_3' OR condition_id = 'c_13'
But it seemed you wanted to filter out the results further by having only c_3 and c_13's which also match b_1 or b_2
SELECT id,condition_id,property_id
FROM table
WHERE (condition_id = 'c_3' OR condition_id = 'c_13')
AND (property_id = 'b_1' OR property_id = 'b_2')
Alternatively,
SELECT id,condition_id,property_id
FROM table
WHERE condition_id IN ('c_3,'c_13')
AND property_id IN ('b_1','b_2')
-Fernis