Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
cach thuc » anh thuc, cac thu
cong cong » cong dong, trong cong, dung cong
cac chu » cac thu, cac che, cac khu
ky thuc » ky tuc, ky thua, ty thuc
ban ve » ban va
ky thu » ly thu, ky thi, ky thuat

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 chu) or (cach thuc)) đe co ban ve ((ky thu) or (ky thuc)) cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((cac chu) OR (cach thuc)) đe co ban ve ((ky thu) OR (ky thuc)) cong cong.
• Adding a wildcard symbol may retrieve word variants: quyen tap ((cac chu) or (cach thuc)) đe co ban ve ((ky thu) or (ky thuc)) cong cong*.