Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
tai cua » thai cua, tai cuc, tri cua
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
co hai » co dai, co hoi, o hai
ve cam » ve cham, ve cac, va cam
cua cu » cua chu, cua cau, cua su
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 ve cam duc van 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 ve cam duc van hanh tai cua cu.
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ((x hoi) or (co hai)). hieu ve cam duc van hanh tai cua cu*.