Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
dang xay » dang van, van xay
hanh vai » hanh vi, hanh va, hanh tai
hieu van » hieu va, thien van, lieu va
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
dao duc » giao duc, tao duoc
tu cach » tu cac
lang xa » lang ha, lang van
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 cach) or (thuat san)) ky ((lang xa) or (dang xay)) hoi. hieu van dao duc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thuat san)) ky ((lang xa) OR (dang xay)) hoi. hieu van dao duc va hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thuat san)) ky ((lang xa) or (dang xay)) hoi. hieu van dao duc va hanh vai cua tre*.