Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, huyen tam
quyen cap » quyen cach, huyen cao, quyen con
cach thuc » anh thuc, cac thu
cong cong » cong dong, trong cong, dung cong
ban vat » bang vat, ben vat, ban va
te cong » tai cong, thi cong, thu cong
vat y » vat ly, vat _

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((quyen tap) OR (quyen cap)) cach thuc đe co ban vat y te cong cong~".
• Adding a wildcard symbol may retrieve word variants: ((quyen tap) OR (quyen cap)) cach thuc đe co ban vat y te cong cong*.