Perhaps you should try some spelling variations:
quyen cach » quyen sach, quyen anh
quyen cap » huyen cao, quyen con, quyen cua
cong cong » cong dong, trong cong, dung cong
toan chi » toan cao, tai chi, luan chi
te cong » tai cong, thi cong, thu cong
ve ky » va ky, ke ky
ve y » ve _, ke y, te y

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

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