Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
ban hanh » ban hang
duc ban » duc tan, duc van, dua ban
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
va cham » va tham
va chat » van chat, va phat, cao chat
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: so sach ky nang x hoi. hieu ((va cham) or (va chat)) duc ban hanh lai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang x hoi. hieu ((va cham) OR (va chat)) duc ban hanh lai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang x hoi. hieu ((va cham) or (va chat)) duc ban hanh lai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang x hoi. hieu ((va cham) or (va chat)) duc ban hanh lai ((cua triet) OR (va triet))*.