Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
tham thuc » nham thuc, pham thuc, tam thuc
cau tren » cu tren, dau tren, ca tren
danh vai » danh sai, danh va, dang van
cuu tre » cua tre, cau treo
vu sach » vu bach, su sach, vu khach
sach ta » sach tai, sach xa, sach ha
thuc va » thuc vat, thuc dan, thuc day
ve tham » va tham, ve cham, vi tham
hieu ve » hieu va, hieu van
va ngoi » va nguoi, va ngoai, va nghi
ta hang » va hang, ty hang, te hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ta hang va ngoi. hieu ve tham thuc va ((danh vai) or (doanh van)) ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ta hang va ngoi. hieu ve tham thuc va ((danh vai) OR (doanh van)) ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: vu sach ta hang va ngoi. hieu ve tham thuc va ((danh vai) or (doanh van)) ((cuu tre) or (cau tren))*.