Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » cua viet, su triet, va triet
thanh van » thanh san, thanh toan, thanh phan
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
van cua » vang cua, ban cua, dan cua
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
so sach » so sanh, bo sach, co sach
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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

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