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 thu, ca chu, cac cau
cac khu » cac thu, cac khoi, cac kieu
cac che » cac he, cac chien, cac chat
te cong » tai cong, thi cong, thu cong
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 khu))) or (cac che)) đe co ban ((ve ky) or (ve _)) te cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((((cac chu) OR (cac khu))) OR (cac che)) đe co ban ((ve ky) OR (ve _)) te cong cong.
• Adding a wildcard symbol may retrieve word variants: quyen tap ((((cac chu) or (cac khu))) or (cac che)) đe co ban ((ve ky) or (ve _)) te cong cong*.