Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
tai cua » thai cua, tai cuc, tri cua
va cham » va chat, va tham
te sac » te sach, te cac, te san
cua tu » cua tuc, cua su, cua cu
va cai » va cac, va bai, va dai
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky dang xay hoi. hieu ((va cai) or (va cham)) luc van hanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky dang xay hoi. hieu ((va cai) OR (va cham)) luc van hanh tai cua tu.
• Adding a wildcard symbol may retrieve word variants: te sac ky dang xay hoi. hieu ((va cai) or (va cham)) luc van hanh tai cua tu*.