Perhaps you should try some spelling variations:
nang cai » nang tai, nang cap, nang can
va thanh » gia thanh, ban thanh, va tinh
thanh vi » hanh vi, thanh va, thanh ve
so sanh » do sanh
qua cau » quan cau, qua cac, qua ca
cau luc » cau truc, cau phuc
cua tre » cua te, cuu tre, cua triet
sanh y » sinh y, anh y, hanh y
luc va » duc va, tuc va, loc 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: so sanh y ((nang cai) or (nang cao)) hoi. hieu qua cau luc va thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y ((nang cai) OR (nang cao)) hoi. hieu qua cau luc va thanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sanh y ((nang cai) or (nang cao)) hoi. hieu qua cau luc va thanh vi cua tre*.