Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
cao thuc » cao thuoc, bao thuc, can thuc
ve triet » va trien, su triet
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
hang vi » hang va, hanh vi, hang di
va cao » va cac, va co, va dao
vi ve » va ve, gi ve, ve ve

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((lang xa) OR (lang van)) hoi. hieu va cao thuc va hang vi ve triet~.
• Adding a wildcard symbol may retrieve word variants: so sach y ((lang xa) or (lang van)) hoi. hieu va cao thuc va hang vi ve triet*.