Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
so sach » so sanh, bo sach, co sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang ha » long ha
lang xa » dang xay, lang van

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 y ((lang xa) or (lang ha)) hoi. hieu ve ((cam duc) OR (cao duc)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((lang xa) OR (lang ha)) hoi. hieu ve ((cam duc) OR (cao duc)) va hanh vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y ((lang xa) or (lang ha)) hoi. hieu ve ((cam duc) OR (cao duc)) va hanh vai cua tre*".