Perhaps you should try some spelling variations:
ve triet » va trien, su triet
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
sach vu » sach va, sach tu, sach uu
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
nang ma » tang ma, sang ma, nang cao
vu nang » vuc nang, va nang, vu dang
va cao » va cac, va co, va dao
ma hoi » mai hoi, xa hoi, ma hoa
ki ve » ke ve, gi ve, vi ve

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