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
ta trang » va trang, thai trang, thu trang
trang xa » trang va, trang ha, trong xa
cuu tre » cua tre, cau treo
su sach » so sach, vu sach
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

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ta trang xa hoi. 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: su sach ta trang xa hoi. hieu ve tham thuc va ((danh vai) OR (doanh van)) ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ta trang xa hoi. hieu ve tham thuc va ((danh vai) or (doanh van)) ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: su sach ta trang xa hoi. hieu ve tham thuc va ((danh vai) or (doanh van)) ((cuu tre) OR (cau tren))*.