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
va tham » van tham, va cham, va thanh
sach ta » sach tai, sach xa, sach va
hieu va » lieu va, hieu qua
sach ha » sach nha, sach han, sach xa
cuu tre » cua tre, cau tren, cau treo
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 va tham thuc va ((danh vai) or (doanh van)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ta) OR (sach ha)) trang va noi. hieu va tham thuc va ((danh vai) OR (doanh van)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: su ((sach ta) or (sach ha)) trang va noi. hieu va tham thuc va ((danh vai) or (doanh van)) cuu tre*.