Perhaps you should try some spelling variations:
hanh lam » thanh lap, hanh kem, hanh va
dung van » duong van, dung va, dang van
so sach » so sanh, bo sach, co sach
lam cua » nam cua, lam chat
duy van » duy vat
vu pham » su pham, vi pham, vu kham
sach ty » sach y, sach tu, sach thu
hieu vu » hieu va, hieu ve, hieu su
tang ma » tang van
cua tre » cua te, cuu tre, cua triet

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 ((tang ma) or (mang may)) hoi. hieu vu pham ((duy van) OR (dung van)) hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((tang ma) OR (mang may)) hoi. hieu vu pham ((duy van) OR (dung van)) hanh lam cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty ((tang ma) or (mang may)) hoi. hieu vu pham ((duy van) OR (dung van)) hanh lam cua tre*".