Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
pham thuc » phap thuc, pham chuc, nham thuc
thuc ban » thuoc ban, thuc dan, thu ban
thanh di » thanh doi, thanh de, thanh do
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
xang ma » tang ma, nang ma, sang ma
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
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: so sach ty xang ma hoi. ((lieu va) or (hieu qua)) pham thuc ban thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty xang ma hoi. ((lieu va) OR (hieu qua)) pham thuc ban thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ty xang ma hoi. ((lieu va) or (hieu qua)) pham thuc ban thanh di cua tre*.