Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
cac dat » cac dan, cai dat, cac dai
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
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 ky ((nang ma) OR (sang ma)) hoi. lieu va cac dat ((va hanh) or (va danh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((nang ma) OR (sang ma)) hoi. lieu va cac dat ((va hanh) OR (va danh)) vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((nang ma) OR (sang ma)) hoi. lieu va cac dat ((va hanh) or (va danh)) vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((nang ma) OR (sang ma)) hoi. lieu va cac dat ((va hanh) or (va danh)) vi cua vat*.