Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
cong cong » cong dong, trong cong, dung cong
cac khoi » cac thoi, cac khoan, hoc khoi
thi cong » tai cong, thien cong
ban ke » ban kem, ban ky, dan ke
ban ve » ban va
y thi » ky thi, y thai, ly thi
tuyen » truyen, quyen

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

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