CREATE TABLE table_66191 ("Celestial Stem" CLOB, "Chinese Mandarin Pinyin" CLOB, "Cantonese Jyutping" CLOB, "Wuu Wuupin" CLOB, "Japanese kunyomi" CLOB, "Japanese on'yomi" CLOB, "Korean  (  RR  ) " CLOB, "Manchu  (  M\\u00f6llendorff  ) " CLOB, "Vietnamese" CLOB, "Yin and Yang  (  \\u9670\\u967d  ) " CLOB, "Wu Xing  (  \\u4e94\\u884c  ) " CLOB, "Wu xing correlations" CLOB)

What Japanese On'yomi has Vietnamese of M u?
SELECT "Japanese on'yomi" FROM table_66191 WHERE "Vietnamese" = 'mậu'
SELECT "Japanese on'yomi" FROM "table_66191" WHERE "Vietnamese" = 'mậu'