Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
thai cua » than cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ky lang » ky nang, ky dang, ky tang
hai ky » thai ky, hoi ky, hai ly
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
su hai » su tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su hai ky lang xa hoi. ((hieu ve) or (hieu qua)) cam ((xuc va) OR (luc va)) nhanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su hai ky lang xa hoi. ((hieu ve) OR (hieu qua)) cam ((xuc va) OR (luc va)) nhanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su hai ky lang xa hoi. ((hieu ve) or (hieu qua)) cam ((xuc va) OR (luc va)) nhanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su hai ky lang xa hoi. ((hieu ve) or (hieu qua)) cam ((xuc va) OR (luc va)) nhanh thai cua tre*.