Perhaps you should try some spelling variations:
hang cong » dang cong, hang nong, bang cong
thu sach » tu sach, thuat sach, thuoc sach
cu triet » cua triet, cau triet, tu triet
su triet » su viet, su tien, ve triet
cao hoi » cau hoi, co hoi, cao hoc
va hang » van hang, va nang, va lang
y nang » ky nang, ly nang, v nang
va hoc » van hoc

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