Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
vu sach » vu bach, su sach, vu khach
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
ve cac » va cac, vien cac
vi cua » vai cua, di cua
x hoi » o hoi, x ho, 5 hoi

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) or (vu sach)) ky nang ((x hoi) or (xa hoi)). hieu ve cac duc va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang ((x hoi) OR (xa hoi)). hieu ve cac duc va hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang ((x hoi) or (xa hoi)). hieu ve cac duc va hanh vi cua triet*.