Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
dai thuc » dan thuc, dai thu, dai thua
mai hoi » mai khoi, dai hoi, lai hoi
xa hanh » xa thanh, xa khanh, da hanh
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky
va dai » va dao, vi dai, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu can ky nang mai hoi. lieu va dai thuc ((xa hanh) or (va hanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky nang mai hoi. lieu va dai thuc ((xa hanh) OR (va hanh)) tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu can ky nang mai hoi. lieu va dai thuc ((xa hanh) or (va hanh)) tai cua tre*.