Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cac toc » cac toi, cac nuoc, cac thoi
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
su sai » su tai, su hai, su dai
sai ky » sac ky
toc va » hoc va, toc ta, tuc va
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky nang xa hoi. ((hieu va) or (lieu va)) cac toc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang xa hoi. ((hieu va) OR (lieu va)) cac toc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sai ky nang xa hoi. ((hieu va) or (lieu va)) cac toc va hanh vi cua tre*.