Perhaps you should try some spelling variations:
ve triet » va trien, su triet
ban danh » ban doanh, ban hanh, van danh
cac duc » cac du, cao duc, cac dac
kien ve » kien de, kien va, dien ve
ban dan » ban hang, ban hanh, ban quan
vu sach » vu bach, su sach, vu khach
sach vu » sach va, sach tu, sach uu
tang ma » mang may, tang van
hieu va » lieu va, hieu qua

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

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