Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
thuc xay » thuc day, tuc xay, thuat xay
hanh tai » thanh tai, hang tai, hinh tai
cao hoc » co hoc, cho hoc, chat hoc
han tai » hang tai, nhan tai, van tai
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu san, tu bac

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) or (tu cac)) ky nang cao hoc. liem 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) OR (tu cac)) ky nang cao hoc. liem ha nam thuc xay ((hanh tai) OR (han tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu cac)) ky nang cao hoc. liem ha nam thuc xay ((hanh tai) or (han tai)) cua tre*.