Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
truc ban » thuc ban, truc dan, truc van
ban hanh » ban hang
hanh hai » thanh hai, nhanh hai, hang hai
va triet » va thiet, va trien, cua triet
ve triet » va trien, su triet
tu sach » thu sach, su sach, te sach
ky dang » ky nang
ky danh » ky anh

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky dang) or (ky danh)) xa hoi. lieu va cac truc ban hanh hai ((va triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky dang) OR (ky danh)) xa hoi. lieu va cac truc ban hanh hai ((va triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky dang) or (ky danh)) xa hoi. lieu va cac truc ban hanh hai ((va triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky dang) or (ky danh)) xa hoi. lieu va cac truc ban hanh hai ((va triet) OR (ve triet))*.