Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh bai
so sach » so sanh, bo sach, co sach
vai cua » dai cua, hai cua, lai cua
xa tinh » va tinh, ha tinh, ca tinh
sach lo » sach dao, sach doi, sach hoi
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
lo hang » ly hang, le hang, cho hang
va hoc » van hoc
cam tu » cam thu, nam tu, tam tu
dam tu » nam tu, tam tu, dam thuc
va hoi » xa hoi, va hoa

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 lo hang ((va hoi) or (va hoc)). hieu va ((cam tu) OR (dam tu)) xa tinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach lo hang ((va hoi) OR (va hoc)). hieu va ((cam tu) OR (dam tu)) xa tinh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach lo hang ((va hoi) or (va hoc)). hieu va ((cam tu) OR (dam tu)) xa tinh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach lo hang ((va hoi) or (va hoc)). hieu va ((cam tu) OR (dam tu)) xa tinh vai cua tre*.