Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
van cac » van hac, van cau, van bac
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
du va » dau va, tu va, su va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang ((ma hoa) OR (mai hoi)). hieu van cac du va thanh dai ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang ((ma hoa) or (mai hoi)). hieu van cac du va thanh dai ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang ((ma hoa) or (mai hoi)). hieu van cac du va thanh dai ((cua tre) OR (cuu tre))*.