Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua
o van » so van, do van, ho van

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 hoi. hieu va cam ((o van) or (vo van)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang xa hoi. hieu va cam ((o van) OR (vo van)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky nang xa hoi. hieu va cam ((o van) or (vo van)) hanh vi cua tre*.