Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
ban hanh » ban hang
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang
ve cap » ve cac, ve cai, ve cau
le cap » le cau
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 hoi. hieu ((ve cap) or (le cap)) cuu ((ban doanh) or (ban hanh)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang xa hoi. hieu ((ve cap) OR (le cap)) cuu ((ban doanh) OR (ban hanh)) vi cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach y lang xa hoi. hieu ((ve cap) or (le cap)) cuu ((ban doanh) or (ban hanh)) vi cau tren*.