Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
cong cong » cong dong, trong cong, dung cong
cac chu » cac khu, ca chu, cac cau
cac thu » cach thuc, cac thoi
cac che » cac he, cac chien, cac chat
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 tap ((((cac chu) or (cac thu))) or (cac che)) đe co ban ve ky tai cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((((cac chu) OR (cac thu))) OR (cac che)) đe co ban ve ky tai cong cong.
• Adding a wildcard symbol may retrieve word variants: quyen tap ((((cac chu) or (cac thu))) or (cac che)) đe co ban ve ky tai cong cong*.