Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
day thuc » dan thuc, cay thuc, dai thuc
ban hang » ngan hang
dai hoi » dai hai, dai moi
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 day » va dao, va dau, va dap

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 ((dai hoi) OR (dai hoc)). lieu va day thuc ((xanh hanh) or (ban hang)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky nang ((dai hoi) OR (dai hoc)). lieu va day thuc ((xanh hanh) OR (ban hang)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ky nang ((dai hoi) OR (dai hoc)). lieu va day thuc ((xanh hanh) or (ban hang)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu can ky nang ((dai hoi) OR (dai hoc)). lieu va day thuc ((xanh hanh) or (ban hang)) tai cua tre*.