Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
nam thuoc » nam thuc, nam thu, cay thuoc
dang hai » dang khai, hang hai, dung hai
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hai hoi » dai hoi, hai moi, hai hai
vai cau » van cau, vai cac, lai chau
ky dang » ky nang, ky danh
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky dang hai hoi. hieu va ((nam thuoc) OR (nha thuoc)) va hanh ((vai cau) or (va cau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky dang hai hoi. hieu va ((nam thuoc) OR (nha thuoc)) va hanh ((vai cau) OR (va cau)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky dang hai hoi. hieu va ((nam thuoc) OR (nha thuoc)) va hanh ((vai cau) or (va cau)) treo".
• Adding a wildcard symbol may retrieve word variants: tu cac ky dang hai hoi. hieu va ((nam thuoc) OR (nha thuoc)) va hanh ((vai cau) or (va cau)) treo*.