Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh dai » thanh hai, thanh tai, thanh dat
cua triet » cua viet, su triet, va triet
su sach » so sach
vu sach » vu bach, vu khach
van bac » van bao, van hac, dan bac
dai ban » dai han, tai ban, di ban
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

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) or (vu sach)) y nang x hoi. hieu ((van bac) or (van ban)) dai ban thanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y nang x hoi. hieu ((van bac) OR (van ban)) dai ban thanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) y nang x hoi. hieu ((van bac) or (van ban)) dai ban thanh dai cua triet*.