Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
kho tang » cao tang
sach kho » bach khoa, sach dao, sach nha
va hanh » van hanh, va thanh, ban hanh
tang ma » mang may, tang van
va cham » va chat, va tham
va danh » va dinh, va dan, dia danh
va cao » va cac, va co, va dao
ma hoi » mai hoi, xa hoi, ma hoa
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: thuoc sach kho tang ma hoi. hieu ((va cham) or (va cao)) duc ((va hanh) OR (va danh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach kho tang ma hoi. hieu ((va cham) OR (va cao)) duc ((va hanh) OR (va danh)) vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach kho tang ma hoi. hieu ((va cham) or (va cao)) duc ((va hanh) OR (va danh)) vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thuoc sach kho tang ma hoi. hieu ((va cham) or (va cao)) duc ((va hanh) OR (va danh)) vi cua vat*.