Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh tai » thanh hai, thanh toan, doanh tai
ve cham » va cham, ve chat, vu cham
tai cua » thai cua, tai cuc, tri cua
duc ban » duc tan, duc van, dua ban
luc ban » cuc ban, luc bat, luc van
vu sach » vu bach, su sach, vu khach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sach)) ky tang ma hoi. hieu ve cham ((luc ban) OR (duc ban)) thanh tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) ky tang ma hoi. hieu ve cham ((luc ban) OR (duc ban)) thanh tai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (so sach)) ky tang ma hoi. hieu ve cham ((luc ban) OR (duc ban)) thanh tai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) ky tang ma hoi. hieu ve cham ((luc ban) OR (duc ban)) thanh tai cua triet*.