Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh bai
so sach » so sanh, bo sach, hoc sach
vai cua » dai cua, hai cua, lai cua
va tinh » may tinh
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
lo hang » ly hang, le hang, cho hang
co sach » bo sach, cuon sach, hoc sach
va hoi » xa hoi, va hoc, va hoa
tuc va » thuc va, truc va, tuc xa

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