Perhaps you should try some spelling variations:
hanh lam » thanh lap, hanh kem, hanh va
sach ty » sach tu, sach thu, xach tay
tang ma » tang van
hieu su » hieu sau, tieu su, hieu so
su pham » san pham
va hanh » van hanh, va thanh, va danh
lam cua » nam cua, lam chat
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: su ((sach ty) OR (sach y)) ((tang ma) or (mang may)) hoi. hieu su pham duc va hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) ((tang ma) OR (mang may)) hoi. hieu su pham duc va hanh lam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach y)) ((tang ma) or (mang may)) hoi. hieu su pham duc va hanh lam cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach y)) ((tang ma) or (mang may)) hoi. hieu su pham duc va hanh lam cua tre*.