Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
cao thuc » cao thuoc, bao thuc, can thuc
lang xa » lang ha, dang xay
qua cao » qua cac, qua ca, qua cai
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
so sach » so sanh, bo sach, co sach
dai va » mai va
di va » di vao, doi va, di vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((lang xa) OR (lang van)) hoi. hieu qua cao thuc va hang ((di va) or (dai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((lang xa) OR (lang van)) hoi. hieu qua cao thuc va hang ((di va) OR (dai va)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y ((lang xa) OR (lang van)) hoi. hieu qua cao thuc va hang ((di va) or (dai va)) triet*".