Perhaps you should try some spelling variations:
phan thuc » nhan thuc, phap thuc, pham thuc
trong van » trong cac
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
tang van » dang van, hoang van, tang luan
thuc van » thuc vat, thuc dan, thuc va
thanh di » thanh doi, thanh de, thanh do
hieu ve » hieu va, hieu van
ve phan » va phan, ke phan, ve phat
cua tre » cua te, cuu tre, cua triet
sach o » sach lo, sac o, sach y
di cua » dai cua, doi cua, de 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 o ((tang van) or (trong van)) hoi. hieu ve phan thuc van thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach o ((tang van) OR (trong van)) hoi. hieu ve phan thuc van thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach o ((tang van) or (trong van)) hoi. hieu ve phan thuc van thanh di cua tre*.