Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
cac truc » cau truc, cac tru, cac trung
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
long ha » dong ha, cong ha, dong hoa
hieu ve » hieu va, hieu van
va hanh » va thanh, va danh, ban hanh
ve cac » va cac, vien cac
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach _ ((lang ha) OR (long ha)) noi. hieu ve cac truc ((va hanh) OR (van hanh)) vi cua thuoc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach _ ((lang ha) OR (long ha)) noi. hieu ve cac truc ((va hanh) or (van hanh)) vi cua thuoc~".
• Adding a wildcard symbol may retrieve word variants: te sach _ ((lang ha) OR (long ha)) noi. hieu ve cac truc ((va hanh) or (van hanh)) vi cua thuoc*.