Perhaps you should try some spelling variations:
ban hang » ngan hang
hieu cua » hieu qua, dieu cua, bieu cua
hang tap » hang tai, han tap, hang tmcp
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
cac tac » cac toc, cac bac, cac dac
tac ban » tai ban, cac ban, tao ban
tap cuu » cap cuu, tap cua
cuu tre » cua tre, cau tren, cau treo
x hoi » xa hoi, o hoi, 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 (x ho)). hieu cua cac tac ban hang tap cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky nang ((x hoi) OR (x ho)). hieu cua cac tac ban hang tap cuu tre".
• Adding a wildcard symbol may retrieve word variants: so sanh ky nang ((x hoi) OR (x ho)). hieu cua cac tac ban hang tap cuu tre*.