Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
toc sach » hoc sach, doc sach, thuoc sach
va triet » va thiet, ve triet, cua triet
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
bao so » bai so, bao co, bao ho
so van » su van, vo van
ve bao » te bao, va bao
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 (toc sach)) ky nang x hoi. hieu ve bao so van hanh vi ((va triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang x hoi. hieu ve bao so van hanh vi ((va triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang x hoi. hieu ve bao so van hanh vi ((va triet) or (va trien))*.