Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
cach thuc » cac thu
cong cong » cong dong, trong cong, dung cong
anh thuc » am thuc, dan thuc, anh tu
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.

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