Perhaps you should try some spelling variations:
cong cong » cong dong, trong cong, dang cong
dung cong » dung trong
cac che » cac he, cac chien, cac chat
cac thu » cach thuc, cac thoi
ban le » ban ve
ky tai » ly tai, ky thi, kg tai
le ky » ke ky, ve ky, ly ky
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 che) or (cac thu)) đe co ban le ky tai ((cong cong) or (dung cong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tuyen tap ((cac che) OR (cac thu)) đe co ban le ky tai ((cong cong) OR (dung cong)).
• Adding a wildcard symbol may retrieve word variants: tuyen tap ((cac che) or (cac thu)) đe co ban le ky tai ((cong cong) or (dung cong))*.