Perhaps you should try some spelling variations:
ban hanh » ban hang
cau luc » cau truc, cau phuc
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ve cau » ke cau, va cau, ve cac
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
vi va » vi van, vai va, bi va
vu va » vu van, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ma hoi. hieu ve cau luc ((va hanh) or (ban hanh)) ((vi va) OR (vu va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu ve cau luc ((va hanh) OR (ban hanh)) ((vi va) OR (vu va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ma hoi. hieu ve cau luc ((va hanh) or (ban hanh)) ((vi va) OR (vu va)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu ve cau luc ((va hanh) or (ban hanh)) ((vi va) OR (vu va)) triet*.