Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh di » thanh doi, thanh de, thanh do
truc ban » thuc ban, truc dan, truc van
dau truc » cau truc, dai truc, doan truc
sach ty » sach tu, sach thu, xach tay
mai hoi » mai khoi, dai hoi, lai hoi
cuu tre » cua tre, cau tren, cau treo
ma hoi » xa hoi, ma hoa, me hoi
va dau » va dao
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach y)) nang ((ma hoi) OR (mai hoi)). lieu va dau truc ban thanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang ((ma hoi) OR (mai hoi)). lieu va dau truc ban thanh di cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach y)) nang ((ma hoi) OR (mai hoi)). lieu va dau truc ban thanh di cuu tre*".