Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
dung cong » dung trong
cac chat » cao chat, cac thuat, cac nha
tai dung » trai dung, thi dung, mai dung
cac chu » cac thu, cac khu, ca chu
cac che » cac he, cac chien, sach che
ve ty » ve ky, ve y, ve ly
ve tu » ve thu, va tu, ve su

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 chat)))) đe co ban ((ve ty) OR (ve tu)) tai dung cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((cac chu) OR (((cac che) OR (cac chat)))) đe co ban ((ve ty) OR (ve tu)) tai dung cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tap ((cac chu) or (((cac che) or (cac chat)))) đe co ban ((ve ty) OR (ve tu)) tai dung cong".
• Adding a wildcard symbol may retrieve word variants: quyen tap ((cac chu) or (((cac che) or (cac chat)))) đe co ban ((ve ty) OR (ve tu)) tai dung cong*.