Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
ban hanh » ban hang
cac truc » cau truc, cac tru, cac trung
va hanh » van hanh, va thanh, va danh
su sach » so sach
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
vu sach » vu bach, vu khach
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
vi va » vi van, vai va, vu 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) or (vu sach)) ly nang ma hoi. hieu ve cac truc ((va hanh) or (ban hanh)) vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ly nang ma hoi. hieu ve cac truc ((va hanh) OR (ban hanh)) vi va triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ly nang ma hoi. hieu ve cac truc ((va hanh) or (ban hanh)) vi va triet*.