Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
dang xay » van xay
dang van » hoang van, hang va
thuc dan » thuc hanh, hoc dan, thuc vat
tai cuu » tai cuc, tai buu, tai cua
dan tai » van tai, dan thi, han tai
dan dan » dang dan, ban dan, dao dan
toc sac » toc sach, toc san, hoc sach
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
va nam » van nam, ha nam, va nay
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky ((dang xay) or (dang van)) hoi. hieu va nam thuc dan dan tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky ((dang xay) OR (dang van)) hoi. hieu va nam thuc dan dan tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sac ky ((dang xay) or (dang van)) hoi. hieu va nam thuc dan dan tai cuu tre*.