Perhaps you should try some spelling variations:
dung cong » dung trong
cong cong » cong dong, trong cong, dang cong
cach tu » cach thuc
cac che » cac he, cac chien, cac chat
cac khu » cac thu, cac khoi, cac kieu
ban ke » ban kem, ban ve, ban le
ke y » ke ky, ke o
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 khu))) or (cach tu)) đe co ban ke y te ((cong cong) OR (dung cong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tuyen tap ((((cac che) OR (cac khu))) OR (cach tu)) đe co ban ke y te ((cong cong) OR (dung cong)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tuyen tap ((((cac che) or (cac khu))) or (cach tu)) đe co ban ke y te ((cong cong) OR (dung cong))".
• Adding a wildcard symbol may retrieve word variants: tuyen tap ((((cac che) or (cac khu))) or (cach tu)) đe co ban ke y te ((cong cong) OR (dung cong))*.