Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
hanh cong » thanh cong, hang cong, hanh dong
thu sach » tu sach, thuat sach, thuoc sach
cu triet » cua triet, su triet, tu triet
te sach » toc sach
cao hoi » cau hoi, co hoi, cao hoc
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
va hoc » van hoc
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) or (te sach)) y nang cao hoi. lieu va hoc nuoc va hanh cong ((cu triet) OR (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) y nang cao hoi. lieu va hoc nuoc va hanh cong ((cu triet) OR (cau triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) y nang cao hoi. lieu va hoc nuoc va hanh cong ((cu triet) OR (cau triet))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) y nang cao hoi. lieu va hoc nuoc va hanh cong ((cu triet) OR (cau triet))*.