Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
doanh van » doan van, doanh va, doanh ban
trang va » tran van, hang va
danh vai » danh sai, danh va, dang van
thuc va » thuc vat, thuc dan, thuc day
ve tham » va tham, ve cham, vi tham
sach ta » sach tai, sach xa, sach va
hieu ve » hieu va, hieu van
sach ha » sach nha, sach han, sach xa
cua tre » cua te, cuu tre, cua triet
va noi » van noi, va ngoi, va nuoi

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) or (sach ha)) trang va noi. hieu ve tham thuc va ((danh vai) or (doanh van)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ta) OR (sach ha)) trang va noi. hieu ve tham thuc va ((danh vai) OR (doanh van)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ta) or (sach ha)) trang va noi. hieu ve tham thuc va ((danh vai) or (doanh van)) cua tre*.