Perhaps you should try some spelling variations:
luyen tap » tuyen tap, luyen thi
quyen cap » quyen cach, huyen cao, quyen con
cach thuc » cac thu
cong cong » cong dong, trong cong, dung cong
anh thuc » am thuc, dan thuc, anh tu
bang vat » bang va, dang vat, cang vat
co bang » cao bang, con bang, co ban
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: ((luyen tap) or (quyen cap)) ((cach thuc) OR (anh thuc)) đe co bang vat y te cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((luyen tap) OR (quyen cap)) ((cach thuc) OR (anh thuc)) đe co bang vat y te cong cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((luyen tap) or (quyen cap)) ((cach thuc) OR (anh thuc)) đe co bang vat y te cong cong".
• Adding a wildcard symbol may retrieve word variants: ((luyen tap) or (quyen cap)) ((cach thuc) OR (anh thuc)) đe co bang vat y te cong cong*.