Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
tay quang » tac quang, tai quang, tao quang
van nhan » van phan, van thanh, danh nhan
quang ma » xquang ma, quang va, quang manh
sach tay » xach tay, sach hay, sach nay
luc ban » duc ban, cuc ban, luc bat
so sach » so sanh, bo sach, co sach
va nhan » ca nhan, va phan, va nha
cuu tre » cua tre, cau tren, cau treo
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tay quang ma hoa. hieu ((va nhan) OR (van nhan)) luc ban doanh tai ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tay quang ma hoa. hieu ((va nhan) OR (van nhan)) luc ban doanh tai ((cua te) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tay quang ma hoa. hieu ((va nhan) OR (van nhan)) luc ban doanh tai ((cua te) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sach tay quang ma hoa. hieu ((va nhan) OR (van nhan)) luc ban doanh tai ((cua te) or (cuu tre))*.