Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
thang ma » thang mua, tang ma, than ma
thang va » hang va, trang va, thong va
sach duc » sach duoc, sach dung, sach nuoc
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
vi cua » vai cua, di cua

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 duc ((thang ma) OR (thang va)) hoi. hieu ve ((nam thuc) or (nam thuoc)) va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach duc ((thang ma) OR (thang va)) hoi. hieu ve ((nam thuc) OR (nam thuoc)) va hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach duc ((thang ma) OR (thang va)) hoi. hieu ve ((nam thuc) or (nam thuoc)) va hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: su sach duc ((thang ma) OR (thang va)) hoi. hieu ve ((nam thuc) or (nam thuoc)) va hanh vi cua vat*.