Perhaps you should try some spelling variations:
sach kem » hanh kem
lang van » dang van, tang van, hoang van
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
hieu va » lieu va, hieu qua
van hoi » van hoa, van hoc, van hoe
cua tre » cua te, cuu tre, cua triet
va nam » van nam, ha nam, va nay
sac ky » cac ky, sai ky

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 kem) or (sac ky)) lang van hoi. hieu va nam cua ban ((danh vi) or (danh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sac ky)) lang van hoi. hieu va nam cua ban ((danh vi) OR (danh di)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sac ky)) lang van hoi. hieu va nam cua ban ((danh vi) or (danh di)) cua tre*.