Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cham thuc » nham thuc, pham thuc, tham thuc
toc sach » hoc sach, doc sach, thuoc sach
sach tay » xach tay, sach hay, sach nay
lang van » dang van, hoang van, giang van
tang van » dang van, hoang van, trong van
thuc van » thuc vat, thuc dan, thuc va
thanh va » thanh van, hanh va, thanh ha
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tay ((lang van) OR (tang van)) hoi. hieu ve cham thuc van thanh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tay ((lang van) OR (tang van)) hoi. hieu ve cham thuc van thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach tay ((lang van) OR (tang van)) hoi. hieu ve cham thuc van thanh va cua tre*.