Perhaps you should try some spelling variations:
hanh cong » thanh cong, hang cong, hanh dong
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
cu triet » cua triet, cau triet, su triet
cao hoc » co hoc, cho hoc, chat hoc
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cong cu » chung cu
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi
nuoc » quoc, duoc, ngoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ((cao hoc) or (co hoi)). ((hieu van) OR (hieu va)) hoc nuoc va hanh cong cu triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((cao hoc) OR (co hoi)). ((hieu van) OR (hieu va)) hoc nuoc va hanh cong cu triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ((cao hoc) or (co hoi)). ((hieu van) OR (hieu va)) hoc nuoc va hanh cong cu triet".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((cao hoc) or (co hoi)). ((hieu van) OR (hieu va)) hoc nuoc va hanh cong cu triet*.