Perhaps you should try some spelling variations:
nay thuc » nam thuc, cay thuc, day thuc
nang mai » nang ma, nang tai, lang mai
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
xa hanh » xa thanh, xa khanh, da hanh
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
dang ky » dang y, dan ky, dong ky
san ky » sang ky, van ky, dan ky
va nay » va ngay, va cay

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((san ky) or (dang ky)) nang mai hoi. lieu va nay thuc ((xa hanh) OR (va hanh)) tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (dang ky)) nang mai hoi. lieu va nay thuc ((xa hanh) OR (va hanh)) tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) or (dang ky)) nang mai hoi. lieu va nay thuc ((xa hanh) OR (va hanh)) tai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) or (dang ky)) nang mai hoi. lieu va nay thuc ((xa hanh) OR (va hanh)) tai cua tre*.