Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham 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 pham » vi pham, v pham, ve phan
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 pham thuc van thanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach o ((tang van) OR (trong van)) hoi. hieu ve pham 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 pham thuc van thanh di cua tre*.