Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
lang van » dang van, tang van, hoang van
cua tre » cua te, cuu tre, cua triet
cac toc » cac toi, cac nuoc, cac thoi
nang xa » nang x, lang xa, nang ma
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cac loc » cac lop, cac hoc, cac nuoc
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

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

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