Perhaps you should try some spelling variations:
quyen cap » quyen cach, huyen cao, quyen con
van chien » van hien, van hieu, van tien
dung cong » dung trong
tai dung » trai dung, thi dung, mai dung
cac thu » cach thuc, cac thoi
ban ve » ban va
ky tai » ly tai, ky thi, kg tai
ve ky » va ky, ke ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: quyen cap ((cac thu) or (van chien)) đe co ban ve ky tai dung cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen cap ((cac thu) OR (van chien)) đe co ban ve ky tai dung cong*.