Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
so sach » bo sach, co sach, hoc sach
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
nong xa » song xa, dong xa, nong va
tu nong » tu dong, tu cong, tu tong
so sanh » do sanh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

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