Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
doanh van » doan van, doanh va, doanh ban
trung ha » trung hoc, trung tam, trung cap
danh vai » danh sai, danh va, dang van
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
ve tham » va tham, ve cham, vi tham
sach xa » sach dao, sach nha, sach bai
hieu ve » hieu va, hieu van
tang ha » lang ha, tang ma, tang 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 xa ((trung ha) or (tang ha)) 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 xa ((trung ha) OR (tang ha)) hoi. hieu ve tham thuc va ((danh vai) OR (doanh van)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach xa ((trung ha) or (tang ha)) hoi. hieu ve tham thuc va ((danh vai) or (doanh van)) cuu tre*.