Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu hien » bieu hien, dieu hien, chieu chien
hieu vien » hieu viec, thieu nien, hieu tieng
van hanh » van thanh, ban hanh, van anh
thu van » thuc van, thuy van, tu van
cac thu » cach thuc, cac thoi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
vi cua » vai cua, di cua
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.

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