Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
lang van » dang van, tang van, hoang van
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cau duc » cao duc, cau luc, chu duc
hieu va » lieu va, hieu qua
hieu ve » hieu van
sach ly » sach y, sach lo, sach ty
lang xa » lang ha, dang xay
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 ly ((lang xa) OR (lang van)) hoi. ((hieu ve) or (hieu va)) cau duc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly ((lang xa) OR (lang van)) hoi. ((hieu ve) OR (hieu va)) cau duc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly ((lang xa) OR (lang van)) hoi. ((hieu ve) or (hieu va)) cau duc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ly ((lang xa) OR (lang van)) hoi. ((hieu ve) or (hieu va)) cau duc va hanh vai cua tre*.