Perhaps you should try some spelling variations:
luyen tap » tuyen tap, luyen thi
cach thuc » anh thuc
cong cong » cong dong, trong cong, dung cong
thi cong » tai cong, thien cong
cac thu » cac thoi
de le » de ve, do le, de la
ve li » ve ki
ve ky » va ky, ke ky

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 thu) OR (cach thuc)) đe co ban ((((de le) or (ve li))) or (ve ky)) thi cong cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: luyen tap ((cac thu) OR (cach thuc)) đe co ban ((((de le) OR (ve li))) OR (ve ky)) thi cong cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "luyen tap ((cac thu) OR (cach thuc)) đe co ban ((((de le) or (ve li))) or (ve ky)) thi cong cong".
• Adding a wildcard symbol may retrieve word variants: luyen tap ((cac thu) OR (cach thuc)) đe co ban ((((de le) or (ve li))) or (ve ky)) thi cong cong*.