Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
cam thuc » am thuc, nam thuc, cam thu
hieu van » hieu va, thien van, lieu va
lang van » dang van, tang van, hoang van
sach lo » sach dao, sach doi, sach hoi
van cam » van nam, van lam, van cau
thuc va » thuc vat, thuc dan, thuc day
lang xa » lang ha, dang xay
su sach » so sach, vu sach
su va » su van

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

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