Perhaps you should try some spelling variations:
sach kem » hanh kem
ban dan » ban hang, ban hanh, ban quan
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
sai ky » sac ky
va cao » va cac, va co, va dao
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
va cam » va cham, va cac, va cai

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 (sai ky)) lang xa hoi. hieu ((va cam) OR (va cao)) cua ban dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach kem) OR (sai ky)) lang xa hoi. hieu ((va cam) OR (va cao)) cua ban dan vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach kem) or (sai ky)) lang xa hoi. hieu ((va cam) OR (va cao)) cua ban dan vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach kem) or (sai ky)) lang xa hoi. hieu ((va cam) OR (va cao)) cua ban dan vi cua tre*.