Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
thuc cong » thuoc cong, thu cong, chuc cong
cong cong » cong dong, trong cong, dung cong
cac thu » cach thuc, cac thoi
cac che » cac he, cac chien, cac chat
ban vat » bang vat, ben vat, ban va
y thuc » ty thuc, y thuoc, _ thuc
vat y » vat ly, vat _

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

• Performing a fuzzy search may retrieve terms with similar spellings: quyen tap ((cac thu) or (cac che)) đe co ban vat y thuc cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((cac thu) OR (cac che)) đe co ban vat y thuc cong cong.
• Adding a wildcard symbol may retrieve word variants: quyen tap ((cac thu) or (cac che)) đe co ban vat y thuc cong cong*.