Perhaps you should try some spelling variations:
dang xay » dang van, van xay
dang cay » dang ca, dang cac, dung cay
nam thuc » nam thuoc, am thuc, nam thu
toc sac » toc sach, toc san, hoc sach
hieu va » lieu va, hieu qua
vat dan » va dan, van dan, vat ran
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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 cay) or (dang xay)) phoi. hieu va nam thuc vat dan va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky ((dang cay) OR (dang xay)) phoi. hieu va nam thuc vat dan va cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sac ky ((dang cay) or (dang xay)) phoi. hieu va nam thuc vat dan va cua tre*.