Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hieu van » hieu va, thien van, lieu va
he triet » chet triet, hieu triet, nha triet
hanh nam » thanh nam, hanh lam, hanh ngay
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va
so sach » so sanh, bo sach, co sach
xang x » nang x
x hoi » xa hoi, o hoi, x ho

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 ty xang x hoi. ((hieu ve) OR (hieu van)) nam thuc day hanh nam ((he triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty xang x hoi. ((hieu ve) OR (hieu van)) nam thuc day hanh nam ((he triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty xang x hoi. ((hieu ve) OR (hieu van)) nam thuc day hanh nam ((he triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ty xang x hoi. ((hieu ve) OR (hieu van)) nam thuc day hanh nam ((he triet) or (ve triet))*.