Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
thanh ve » hanh ve, thanh va, thanh vien
cac ban » cac dan, cac van, can ban
cuc ban » cua ban, cuu ban, duc ban
te sach » toc sach
ty hang » ly hang, ty xang, thi hang
ty tang » tay tang, ty xang, ky tang
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, ma hoa
ve va » ve van, te va, ke va

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

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