Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc xay » thuc day, tuc xay, thuat xay
nang mai » nang tai, lang mai, nang cai
hanh tai » thanh tai, hang tai, hinh tai
han tai » hang tai, nhan tai, van tai
cua tre » cua te, cuu tre, cua triet
lieu ha » lieu nha, lieu va, liem ha
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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

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