Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
cua triet » cua viet, su triet, va triet
bien cac » vien cac, dien cac, bien ca
vu sach » vu bach, su sach, vu khach
cac tao » cau tao, cac tro, cac tac
tu sach » thu sach, su sach, te sach
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
va cua » va chua, via cua, ca cua
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: ((tu sach) or (vu sach)) ky nang x hoi. thieu bien cac tao ((va dan) OR (ca dan)) va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ky nang x hoi. thieu bien cac tao ((va dan) OR (ca dan)) va cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (vu sach)) ky nang x hoi. thieu bien cac tao ((va dan) OR (ca dan)) va cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ky nang x hoi. thieu bien cac tao ((va dan) OR (ca dan)) va cua triet*.