Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
ban hanh » ban hang
hanh ki » hanh vi, hanh ky, hanh kien
duc ban » duc tan, duc van, dua ban
va chat » van chat, va phat, cao chat
sach tu » sach thu, cach tu, sach ty
sang ma » tang ma, nang ma, sang tao
sach xu » sach xa, cach xu, mach xu
va cham » va tham
ma hoi » mai hoi, xa hoi, ma hoa
ki su » ky su

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 tu) or (sach xu)) sang ma hoi. hieu ((va cham) OR (va chat)) duc ban hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach xu)) sang ma hoi. hieu ((va cham) OR (va chat)) duc ban hanh ki su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (sach xu)) sang ma hoi. hieu ((va cham) OR (va chat)) duc ban hanh ki su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (sach xu)) sang ma hoi. hieu ((va cham) OR (va chat)) duc ban hanh ki su triet*.