Perhaps you should try some spelling variations:
quyen tap » tuyen tap, luyen tap, quyen cap
cong cong » cong dong, trong cong, dang cong
dung cong » dung trong
cac thoi » cac toi, cac hop, cac tro
cac thu » cach thuc
cac chu » cac che, cac khu, ca chu
ban ke » ban kem, ban ve, ban le
ke y » ke ky, ke o

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

• Performing a fuzzy search may retrieve terms with similar spellings: quyen tap ((cac chu) or (((cac thu) or (cac thoi)))) đe co ban ke y te ((cong cong) OR (dung cong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen tap ((cac chu) OR (((cac thu) OR (cac thoi)))) đe co ban ke y te ((cong cong) OR (dung cong)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "quyen tap ((cac chu) or (((cac thu) or (cac thoi)))) đe co ban ke y te ((cong cong) OR (dung cong))".
• Adding a wildcard symbol may retrieve word variants: quyen tap ((cac chu) or (((cac thu) or (cac thoi)))) đe co ban ke y te ((cong cong) OR (dung cong))*.