Perhaps you should try some spelling variations:
vanh dai » van dai, vanh tai, lanh dao
sach kem » hanh kem
lang xa » lang ha, dang xay, lang van
va vanh » va van, va danh, va hanh
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach ky » sach y, sach ty, sach hay
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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