Perhaps you should try some spelling variations:
so triet » su triet, so thiet, bo triet
hanh lam » thanh lap, hanh kem, hanh va
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
cac duc » cac du, cao duc, cac dac
su sach » so sach, vu sach
hieu ve » hieu va
hoa hoi » khoa hoi, hoa hoc, hoa doi
ha hoi » ha noi, xa hoi, va hoi
lam so » lam son, nam so, ham so

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: su sach _ lang ((ha hoi) OR (hoa hoi)). ((hieu ve) OR (hieu van)) cac duc va hanh lam so triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach _ lang ((ha hoi) OR (hoa hoi)). ((hieu ve) or (hieu van)) cac duc va hanh lam so triet~".
• Adding a wildcard symbol may retrieve word variants: su sach _ lang ((ha hoi) OR (hoa hoi)). ((hieu ve) or (hieu van)) cac duc va hanh lam so triet*.