Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hanh tai » thanh tai, hang tai, han tai
dang ky » dang y, dan ky, dong ky
cao hoi » cau hoi, co hoi, cao hoc
thuc xa » thuc xay, tuc xa, thuc va
xa hanh » xa thanh, xa khanh, va hanh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
san ky » sang ky, van ky, dan ky
va nam » van nam, ha nam, va nay

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 cao hoi. lieu va nam thuc xa hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (dang ky)) nang cao hoi. lieu va nam thuc xa hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) or (dang ky)) nang cao hoi. lieu va nam thuc xa hanh tai cua tre*.