Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
doanh van » doan van, doanh va, doanh ban
trang xa » trang ha, trong xa, trang tai
trang va » tran van, hang va
danh vai » danh sai, danh va, dang van
su sach » so sach, vu sach
ve tham » va tham, ve cham, vi tham
thuc va » thuc vat, thuc dan, thuc day
sach ta » sach tai, sach xa, sach ha
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo

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) or (trang va)) hoi. hieu ve 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 ((trang xa) OR (trang va)) hoi. hieu ve tham thuc va ((danh vai) OR (doanh van)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach ta ((trang xa) or (trang va)) hoi. hieu ve tham thuc va ((danh vai) or (doanh van)) cuu tre*.