Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
nam chien » nam hien, nam chi, van chien
dung cong » dung trong
tai dung » trai dung, thi dung, mai dung
cac chu » cac thu, cac khu, ca chu
cac che » cac he, cac chien, cac chat
va kg » va ki, va ke

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 (nam chien)) đe co ban ((va kg) OR (va ky)) tai dung cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((((cac chu) OR (cac che))) OR (nam chien)) đe co ban ((va kg) OR (va ky)) tai dung cong*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tap ((((cac chu) or (cac che))) or (nam chien)) đe co ban ((va kg) OR (va ky)) tai dung cong*".