Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va trien » va truyen, va thiet, va tuyen
va triet » va thiet, ve triet, cua triet
thanh vi » hanh vi, thanh va, thanh ve
pham duy » pham duc
nang tai » hang tai, tang tai, sang tai
tai hoi » tai khoi, dai hoi, tai hai
hieu vi » hieu voi, hieu va, hieu ve
duy ban » uy ban, duy van, duy can
bo sach » co sach, hoc sach
tu cach » tu cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (bo sach)) ky nang tai hoi. hieu vi pham duy ban thanh vi ((va triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (bo sach)) ky nang tai hoi. hieu vi pham duy ban thanh vi ((va triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (bo sach)) ky nang tai hoi. hieu vi pham duy ban thanh vi ((va triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (bo sach)) ky nang tai hoi. hieu vi pham duy ban thanh vi ((va triet) OR (va trien))*.