Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thu sach » thuat sach, thuoc sach, thu hoach
va thanh » gia thanh, ban thanh, va tinh
xuat tuc » xuat thuc, luat tuc, xuat tu
van xuat » san xuat, va xuat, phan xuat
tu sach » su sach, te sach, tu cach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (thu sach)) ky tang ma hoi. hieu van xuat tuc ((va thanh) OR (va dan)) di cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky tang ma hoi. hieu van xuat tuc ((va thanh) OR (va dan)) di cua vat".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky tang ma hoi. hieu van xuat tuc ((va thanh) OR (va dan)) di cua vat*.