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

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 ((cuu tre) or (cua te))~.
• 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 ((cuu tre) OR (cua te)).
• 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 ((cuu tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: so sanh ky nang ((x hoi) OR (o hoi)). hieu qua cac tac ban thang tien ((cuu tre) or (cua te))*.