Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
dang xay » dang van, van xay
ban hanh » ban hang
cau treo » cau theo, cau tren, cau triet
tu sach » thu sach, su sach, te sach
lang xa » lang ha, lang van
hieu ve » hieu va, hieu van
ve cap » ve cac, le cap, ve cai
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((lang xa) OR (dang xay)) hoi. hieu ve cap cuu ((ban doanh) or (ban hanh)) vi cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((lang xa) OR (dang xay)) hoi. hieu ve cap cuu ((ban doanh) OR (ban hanh)) vi cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((lang xa) OR (dang xay)) hoi. hieu ve cap cuu ((ban doanh) or (ban hanh)) vi cau treo".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang xa) OR (dang xay)) hoi. hieu ve cap cuu ((ban doanh) or (ban hanh)) vi cau treo*.