Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
thuc va » thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve nha » ke nha

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (nuoc sach)) ky lang xa hoi. hieu ve nha ((thuc va) OR (thuc vat)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (nuoc sach)) ky lang xa hoi. hieu ve nha ((thuc va) OR (thuc vat)) hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (nuoc sach)) ky lang xa hoi. hieu ve nha ((thuc va) OR (thuc vat)) hanh vai cua tre*".