Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
sach thu » sach thue, sach thieu, sach tham
chua tre » chua tri, cua tre, chua trieu
lang xa » lang ha, lang van
cach tu » cach thuc
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
dinh va » dinh van, dinh ve, tinh va
va chua » vua chua, ca chua, va chu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((cach tu) or (sach thu)) ((lang xa) OR (dang xay)) hoi. hieu van nam thuc va dinh va chua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((cach tu) OR (sach thu)) ((lang xa) OR (dang xay)) hoi. hieu van nam thuc va dinh va chua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((cach tu) or (sach thu)) ((lang xa) OR (dang xay)) hoi. hieu van nam thuc va dinh va chua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((cach tu) or (sach thu)) ((lang xa) OR (dang xay)) hoi. hieu van nam thuc va dinh va chua tre*.