Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
pham thuc » phap thuc, pham chuc, nham thuc
thanh di » thanh doi, thanh de, thanh do
thuc ban » thuoc ban, thuc dan, thu ban
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang ma) OR (tang ma)) hoi. hieu va pham thuc ban thanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang ma) OR (tang ma)) hoi. hieu va pham thuc ban thanh di cua tre*.