Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
pham thuc » phap thuc, pham chuc, nham thuc
dai hoi » dai hai, dai moi
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
su sach » so sach, vu sach
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((dai hoi) or (dai hoc)). hieu ve pham thuc ((va hanh) OR (va danh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((dai hoi) OR (dai hoc)). hieu ve pham thuc ((va hanh) OR (va danh)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((dai hoi) or (dai hoc)). hieu ve pham thuc ((va hanh) OR (va danh)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((dai hoi) or (dai hoc)). hieu ve pham thuc ((va hanh) OR (va danh)) vi cua triet*.