Perhaps you should try some spelling variations:
doanh ban » doanh bat, doanh van, doanh nhan
tham thuc » nham thuc, pham thuc, tam thuc
trang va » tran van, hang va
danh vai » danh sai, danh va, doanh van
tu sach » thu sach, su sach, te sach
y trang » _ trang, y trong, y trung
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
cuu tre » cua tre, cau tren, cau treo
va hoi » xa hoi, va hoc, va hoa

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 trang va hoi. hieu ve tham thuc vat ((danh vai) or (doanh ban)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y trang va hoi. hieu ve tham thuc vat ((danh vai) OR (doanh ban)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y trang va hoi. hieu ve tham thuc vat ((danh vai) or (doanh ban)) cuu tre*.