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

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