Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
ky dang » ky nang
ky danh » ky anh
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
tay ho » tay co, tay o, tay khao
cuc » cuoc, chuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ((ky dang) or (ky danh)) tay ho. hieu va cac tuc van hanh tai ((cuc thue) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky dang) OR (ky danh)) tay ho. hieu va cac tuc van hanh tai ((cuc thue) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky dang) or (ky danh)) tay ho. hieu va cac tuc van hanh tai ((cuc thue) or (cua tre))*.