Perhaps you should try some spelling variations:
doanh dai » doanh tai, doanh dao, doanh giai
ban doanh » van doanh, san doanh, ban danh
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham dua » chay dua, cham giua, pham duc
te sach » toc sach
dao tay » dao tao, dan tay
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cuu tre, cua triet

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 (dao tay)) hoi. hieu van cham dua ban doanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y ((dung tai) OR (dao tay)) hoi. hieu van cham dua ban doanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y ((dung tai) or (dao tay)) hoi. hieu van cham dua ban doanh dai cua tre*.