Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
van chien » van hien, van hieu, van tien
cong cong » cong dong, trong cong, dung cong
cac thoi » cac toi, cac hop, cac tro
cac thu » cach thuc
ban vat » bang vat, ben vat, van vat
te cong » tai cong, thi cong, thu cong

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 thoi))) or (van chien)) đe co ((ban vat) or (ban va)) y te cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((((cac thu) OR (cac thoi))) OR (van chien)) đe co ((ban vat) OR (ban va)) y te cong cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tap ((((cac thu) OR (cac thoi))) or (van chien)) đe co ((ban vat) or (ban va)) y te cong cong".
• Adding a wildcard symbol may retrieve word variants: quyen tap ((((cac thu) OR (cac thoi))) or (van chien)) đe co ((ban vat) or (ban va)) y te cong cong*.