Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
lam thuc » lam thuoc, am thuc, nam thuc
hieu va » lieu va, hieu qua
vu sach » vu bach, su sach, vu khach
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
vi ve » va ve, gi ve, ve ve

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y ((nang xa) or (lang xa)) hoi. ((hieu ve) or (hieu va)) lam thuc van hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y ((nang xa) OR (lang xa)) hoi. ((hieu ve) OR (hieu va)) lam thuc van hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang xa) or (lang xa)) hoi. ((hieu ve) or (hieu va)) lam thuc van hanh vi ve triet*.