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