Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
danh vai » danh sai, danh va, dang van
tu sach » thu sach, su sach, te sach
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, sach thu
thuc va » thuc dan, thuc day
hieu ve » hieu va, hieu van
may hoi » may thoi, tay hoi, mai hoi
ty mang » ty xang, ty hang, tin mang
ve nam » he nam, va nam, le nam

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 ty mang may hoi. hieu ve nam ((thuc va) OR (thuc vat)) ((danh vai) or (doanh van)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty mang may hoi. hieu ve nam ((thuc va) OR (thuc vat)) ((danh vai) OR (doanh van)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty mang may hoi. hieu ve nam ((thuc va) OR (thuc vat)) ((danh vai) or (doanh van)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty mang may hoi. hieu ve nam ((thuc va) OR (thuc vat)) ((danh vai) or (doanh van)) cuu tre*.