Perhaps you should try some spelling variations:
ban hang » ngan hang
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ve cac » va cac, vien cac
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 ty nang ma hoi. hieu ve cac luc ((va hanh) or (ban hang)) ((vi va) OR (vu va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ma hoi. hieu ve cac luc ((va hanh) OR (ban hang)) ((vi va) OR (vu va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ma hoi. hieu ve cac luc ((va hanh) or (ban hang)) ((vi va) OR (vu va)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ma hoi. hieu ve cac luc ((va hanh) or (ban hang)) ((vi va) OR (vu va)) triet*.