Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, tu cach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
hieu va » hieu qua
lang xa » lang ha, dang xay, lang van
ly lang » ly hang, ly vang, le lang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) ly lang xa hoi. ((hieu va) OR (lieu va)) cao duc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ly lang xa hoi. ((hieu va) OR (lieu va)) cao duc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ly lang xa hoi. ((hieu va) OR (lieu va)) cao duc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ly lang xa hoi. ((hieu va) OR (lieu va)) cao duc va hanh vai cua tre*.