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 » lang xa, nang ma, mang xa
hieu va » hieu qua
cac toc » cac toi, cac nuoc, cac thoi
cua tre » cua te, cuu tre, cua triet
su dai » sau dai, si dai, su tai
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 dai ly ((nang xa) OR (nang x)) hoi. ((hieu va) or (lieu va)) cac toc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su dai ly ((nang xa) OR (nang x)) hoi. ((hieu va) OR (lieu va)) cac toc va thanh vi cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su dai ly ((nang xa) OR (nang x)) hoi. ((hieu va) or (lieu va)) cac toc va thanh vi cua tre*".