Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
so sanh » do sanh
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va hanh » va thanh, va danh, ban hanh
so sach » bo sach, co sach, hoc sach
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
ve cau » ke cau, va cau, ve cac
vi ve » va ve, gi ve, ve ve

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