Perhaps you should try some spelling variations:
tuyen tai » truyen tai, tuyen tap, nguyen tai
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
ban ve » ban va
ly te » ly ke, ly ve, ly he

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

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