Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
cong cong » cong dong, trong cong, dang cong
dung cong » dung trong
cac che » cac he, cac chien, cac chat
cac thu » cach thuc, cac thoi
cac chu » cac khu, ca chu, cac cau
ban ve » ban va
ve ky » va ky, ke ky
ky le » ky la

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