Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
tam thuc » tham thuc, am thuc, nam thuc
trang va » tran van, hang va
danh vai » danh sai, danh va, dang van
thuc dan » thuc hanh, hoc dan, thuc vat
cuu tre » cua tre, cau tren, cau treo
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu va, hieu van
va hoi » xa hoi, va hoc, va hoa
ve tam » ve tac, ve tai, va tam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) trang va hoi. hieu ve tam thuc dan ((danh vai) OR (doanh van)) cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) trang va hoi. hieu ve tam thuc dan ((danh vai) or (doanh van)) cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) trang va hoi. hieu ve tam thuc dan ((danh vai) or (doanh van)) cuu tre*.