Perhaps you should try some spelling variations:
quyen cap » quyen cach, huyen cao, quyen cua
quyen con » quyen cong, tuyen chon, nguyen con
cach tieu » sach thieu, cach bien, cach tu
dung cong » dung trong
y thuoc » ly thuoc, ty thuoc, 3 thuoc
ban ve » ban va
y thu » ly thu, ky thu, y thuc

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 con)) cach tieu đe co ban ve ((y thu) or (y thuoc)) dung cong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((quyen cap) OR (quyen con)) cach tieu đe co ban ve ((y thu) OR (y thuoc)) dung cong.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((quyen cap) OR (quyen con)) cach tieu đe co ban ve ((y thu) or (y thuoc)) dung cong".
• Adding a wildcard symbol may retrieve word variants: ((quyen cap) OR (quyen con)) cach tieu đe co ban ve ((y thu) or (y thuoc)) dung cong*.