Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
ban hanh » ban hang
tai cua » thai cua, tai cuc, tri cua
duc ban » duc tan, duc van, dua ban
tu san » thu san, tu ban, tu can
va cao » va cac, va co, va dao
cua cu » cua chu, cua cau, cua su
san ky » sang ky, van ky, dan ky
va cam » va cham, va cac, va cai
co hai » co dai, co hoi, o hai
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang ((x hoi) or (co hai)). hieu ((va cam) OR (va cao)) duc ban hanh tai cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ((x hoi) OR (co hai)). hieu ((va cam) OR (va cao)) duc ban hanh tai cua cu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang ((x hoi) or (co hai)). hieu ((va cam) OR (va cao)) duc ban hanh tai cua cu*".