Perhaps you should try some spelling variations:
quyen cach » quyen sach, quyen anh, quyen cap
cach thuc » anh thuc, cac thu
cong cong » cong dong, trong cong, dang cong
dung cong » dung trong
cac kieu » cach tieu, cac yeu, tac kiem
ban ve » ban va
ve ky » va ky, ke ky
ky te » y te, ky le, ly te

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

• Performing a fuzzy search may retrieve terms with similar spellings: quyen cach ((cach thuc) or (cac kieu)) đe co ban ve ky te ((cong cong) or (dung cong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: quyen cach ((cach thuc) OR (cac kieu)) đe co ban ve ky te ((cong cong) OR (dung cong)).
• Adding a wildcard symbol may retrieve word variants: quyen cach ((cach thuc) or (cac kieu)) đe co ban ve ky te ((cong cong) or (dung cong))*.