Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
nam thuc » nam thuoc, am thuc, nam thu
dang xay » dang van, van xay
quan nam » quang nam, xuan nam, quan am
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
thuc va » thuc vat, thuc dan, thuc day
so sanh » do sanh
lang ha » long ha
cua tre » cua te, cuu tre, cua triet
sanh y » sinh y, anh y, hanh y
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh y ((lang ha) or (dang xay)) hoi. hieu quan nam thuc va dan vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y ((lang ha) OR (dang xay)) hoi. hieu quan nam thuc va dan vai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sanh y ((lang ha) or (dang xay)) hoi. hieu quan nam thuc va dan vai cua tre*.