Perhaps you should try some spelling variations:
luyen tap » tuyen tap, luyen thi
cac khoi » cac thoi, cac khoan, cach thoi
thi cong » tai cong, thien cong
cac thu » cach thuc, cac thoi
ban ve » ban va
ly thi » ly thoi, le thi, ly tai
ve ly » ve ky, ve li, ve y
dong* » dung*

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

• Performing a fuzzy search may retrieve terms with similar spellings: luyen tap ((cac khoi) or (cac thu)) đe co ban ve ly thi cong dong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: luyen tap ((cac khoi) OR (cac thu)) đe co ban ve ly thi cong dong*.