Perhaps you should try some spelling variations:
thang tien » toan tien, thanh vien, thanh nien
bang tien » van tien, ban tieng
so sanh » do sanh
tac ban » tai ban, cac ban, tao ban
cac tac » cac toc, cac bac, cac dac
sanh ky » hanh ky, sang ky, nganh ky
qua cac » cua cac
cua tre » cua te, cuu tre, cua triet
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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 ky nang ((x hoi) OR (o hoi)). hieu qua cac tac ban ((thang tien) or (bang tien)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky nang ((x hoi) OR (o hoi)). hieu qua cac tac ban ((thang tien) OR (bang tien)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky nang ((x hoi) OR (o hoi)). hieu qua cac tac ban ((thang tien) or (bang tien)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sanh ky nang ((x hoi) OR (o hoi)). hieu qua cac tac ban ((thang tien) or (bang tien)) cua tre*.