How’s this?

SELECT * FROM gallery2 WHERE topic_id="753818" UNION SELECT * FROM gallery2 WHERE topic_id="987705" UNION SELECT * FROM gallery2 WHERE topic_id="1620017" UNION SELECT * FROM gallery2 WHERE topic_id="172650" UNION SELECT * FROM gallery2 WHERE topic_id="429128" UNION SELECT * FROM gallery2 WHERE topic_id="1641298" UNION SELECT * FROM gallery2 WHERE topic_id="129908" UNION SELECT * FROM gallery2 WHERE topic_id="1044604" UNION SELECT * FROM gallery2 WHERE topic_id="1176974" UNION SELECT * FROM gallery2 WHERE topic_id="638934" UNION SELECT * FROM gallery2 WHERE topic_id="572001" UNION SELECT * FROM gallery2 WHERE topic_id="621987" UNION SELECT * FROM gallery2 WHERE topic_id="1598980" UNION SELECT * FROM gallery2 WHERE topic_id="374360" UNION SELECT * FROM gallery2 WHERE topic_id="833975" UNION SELECT * FROM gallery2 WHERE topic_id="1744743"