Perhaps you should try some spelling variations:
ban doanh » san doanh, ban danh, toan doanh
van doanh » toan doanh, van dong, van thanh
te sach » toc sach
dan tay » ban tay, dao tay, gian tay
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y ((dung tai) or (dan tay)) hoi. hieu ve cac duc ((ban doanh) OR (van doanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((dung tai) OR (dan tay)) hoi. hieu ve cac duc ((ban doanh) OR (van doanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y ((dung tai) or (dan tay)) hoi. hieu ve cac duc ((ban doanh) OR (van doanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y ((dung tai) or (dan tay)) hoi. hieu ve cac duc ((ban doanh) OR (van doanh)) dai cua tre*.