Perhaps you should try some spelling variations:
hanh lam » thanh lap, hanh kem, hanh va
pham duy » pham duc
hieu vu » hieu va, hieu ve, hieu su
lam cua » nam cua, lam chat
va hanh » van hanh, va thanh, va danh
vu pham » su pham, vi pham, vu kham
so sach » so sanh, bo sach, hoc sach
tang ma » tang van
co sach » bo sach, cuon sach, hoc sach
cua tre » cua te, cuu tre, cua triet
duy va » duy vat, duy van, day va

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