Perhaps you should try some spelling variations:
danh sai » dung sai, danh bat, danh dau
nam danh » nam dinh, nam dan
sai cua » dai cua, hai cua, lai cua
thu nam » tu nam, thu nhap, thu nhat
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
hieu le » hieu he, hieu ly, tieu le
nang ma » tang ma, sang ma, nang cao
sach v » sach va, sach 2, sach vay
ma hoi » mai hoi, xa hoi, ma hoa

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 v) or (sach y)) nang ma hoi. ((hieu le) or (hieu ve)) nam thu nam danh sai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach v) OR (sach y)) nang ma hoi. ((hieu le) OR (hieu ve)) nam thu nam danh sai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach v) or (sach y)) nang ma hoi. ((hieu le) or (hieu ve)) nam thu nam danh sai cua tre*.