Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
thuc van » thuc vat, thuc dan, thuc va
thanh vi » hanh vi, thanh va, thanh ve
van hoi » van hoa, van hoe, van loi
van hoc » van hoa
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
cua tre » cua te, cuu tre, cua triet
y tang » ky tang, 6 tang, 7 tang
vi cua » vai cua, di 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 y tang ((van hoi) OR (van hoc)). hieu ve pham thuc van thanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y tang ((van hoi) OR (van hoc)). hieu ve pham thuc van thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y tang ((van hoi) OR (van hoc)). hieu ve pham thuc van thanh vi cua tre*.