Perhaps you should try some spelling variations:
dai truc » dai thuc, doan truc, dai trung
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
san tay » ban tay, dan tay, han tay
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
san ty » van ty
va dai » va dao, vi dai, va dau
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((san ty) or (san tay)) xang xa hoi. hieu va dai truc van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((san ty) OR (san tay)) xang xa hoi. hieu va dai truc van hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat ((san ty) or (san tay)) xang xa hoi. hieu va dai truc van hanh va cua tre*.