Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cac toc » cac nuoc, cac thoi
cac toi » cac thoi
cua tre » cua te, cuu tre, cua triet
su sai » su tai, su hai, su dai
sai ky » sac ky
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) OR (cac toi)) va thanh 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) OR (cac toi)) va thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky nang xa hoi. ((hieu va) or (lieu va)) ((cac toc) OR (cac toi)) va thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky nang xa hoi. ((hieu va) or (lieu va)) ((cac toc) OR (cac toi)) va thanh vi cua tre*.