Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
hai truc » dai truc, hai trac, hang truc
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
su sach » so sach, vu sach
ty nang » ty xang, ty hang, ly nang
van hai » van ha, van chat, van phan
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 ((ty nang) OR (ky nang)) xa hoi. hieu van hai truc ((ban hanh) or (van hanh)) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ky nang)) xa hoi. hieu van hai truc ((ban hanh) OR (van hanh)) vi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) OR (ky nang)) xa hoi. hieu van hai truc ((ban hanh) or (van hanh)) vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) OR (ky nang)) xa hoi. hieu van hai truc ((ban hanh) or (van hanh)) vi cua triet*.