Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
sach thu » sach thue, sach thieu, sach tham
nuoc ban » nuoc san, quoc ban, buoc ban
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
thu nang » thi nang, thu hang, thu bang
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
te sach » toc sach
ve cac » va cac, vien cac
o hoi » co hoi, o hoc, o hai
x 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: te sach thu nang ((((x hoi) OR (xa hoi))) or (o hoi)). hieu ve cac nuoc ban thanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang ((((x hoi) OR (xa hoi))) OR (o hoi)). hieu ve cac nuoc ban thanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang ((((x hoi) OR (xa hoi))) or (o hoi)). hieu ve cac nuoc ban thanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang ((((x hoi) OR (xa hoi))) or (o hoi)). hieu ve cac nuoc ban thanh vai cua triet*.