Perhaps you should try some spelling variations:
tuyen tai » truyen tai, tuyen tap, nguyen tai
xuyen tai » xuyen tac, nguyen tai, truyen tai
cong cong » cong dong, trong cong, dang cong
dung cong » dung trong
cac thu » cach thuc, cac thoi
ban ke » ban kem, ban ve, ban le
y thi » ky thi, y thai, ly thi
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: ((tuyen tai) or (xuyen tai)) cac thu đe co ban ke y thi ((cong cong) OR (dung cong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tuyen tai) OR (xuyen tai)) cac thu đe co ban ke y thi ((cong cong) OR (dung cong))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tuyen tai) or (xuyen tai)) cac thu đe co ban ke y thi ((cong cong) OR (dung cong))*".