Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
van phap » ban phap, va phap, van phan
hieu van » hieu va, thien van, lieu va
thu hang » thi hang, thuc hanh, thu huong
vai cua » dai cua, hai cua, lai cua
so sach » so sanh, bo sach, co sach
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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