Perhaps you should try some spelling variations:
quyen tai » nguyen tai, truyen tai, luyen thi
xuyen tai » nguyen tai, truyen tai, luyen thi
xuyen tac » nguyen tac, thuyen tac, tuyen tap
cong cong » cong dong, trong cong, dung cong
cac thu » cach thuc, cac thoi
ve y » ve ky, ve _, te y
ke y » ke ky, ke o

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((quyen tai) or (((xuyen tai) OR (xuyen tac)))) cac thu đe co ban ((ve y) or (ke y)) tai cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((quyen tai) OR (((xuyen tai) OR (xuyen tac)))) cac thu đe co ban ((ve y) OR (ke y)) tai cong cong*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((quyen tai) or (((xuyen tai) OR (xuyen tac)))) cac thu đe co ban ((ve y) or (ke y)) tai cong cong*".