Perhaps you should try some spelling variations:
quyen cach » quyen sach, quyen anh, quyen cap
quyen con » quyen cong, tuyen chon, nguyen con
cong cong » cong dong, trong cong, dung cong
cac che » cac he, cac chien, cac chat
ban ve » ban va
y thuc » ty thuc, y thuoc, _ thuc
y thu » ly thu, ky thu, _ thu

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

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