Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hanh kien » danh kien, anh kien, thanh vien
su triet » su viet, su tien, ve triet
sach dat » sach dao, sach danh, sach bai
dat nang » da nang, dat hang, dai nang
kien su » nien su, tien su, vien sau
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
cam thu » nam thu, cac thu, ca thu
hieu va » lieu va, hieu qua
hieu ve » hieu van
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach dat nang x hoi. ((hieu ve) OR (hieu va)) ((cam thu) or (nam thuoc)) va hanh kien su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach dat nang x hoi. ((hieu ve) OR (hieu va)) ((cam thu) OR (nam thuoc)) va hanh kien su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach dat nang x hoi. ((hieu ve) OR (hieu va)) ((cam thu) or (nam thuoc)) va hanh kien su triet".
• Adding a wildcard symbol may retrieve word variants: su sach dat nang x hoi. ((hieu ve) OR (hieu va)) ((cam thu) or (nam thuoc)) va hanh kien su triet*.