Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
tham duc » pham duc, tham du, than duc
ban hang » ngan hang
sach ky » sac ky, sach y, sach ty
va tham » van tham, va cham, va thanh
de cua » le cua, te cua, dieu cua
o hoc » co hoc, mo hoc, so hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang ((o hoc) or (xa hoi)). lieu va tham duc ((ban hanh) OR (ban hang)) de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang ((o hoc) OR (xa hoi)). lieu va tham duc ((ban hanh) OR (ban hang)) de cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang ((o hoc) or (xa hoi)). lieu va tham duc ((ban hanh) OR (ban hang)) de cua triet".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang ((o hoc) or (xa hoi)). lieu va tham duc ((ban hanh) OR (ban hang)) de cua triet*.