Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
trong van » trong cac
dan thanh » dang thanh, danh thanh, ban thanh
tang van » dang van, hoang van, tang luan
thuc dan » thuc hanh, hoc dan, thuc vat
thanh vi » hanh vi, thanh va, thanh ve
hieu va » lieu va, hieu qua
va cham » va chat, va tham
cua tre » cua te, cuu tre, cua triet
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky
vi cua » vai cua, di cua

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 cai ky ((tang van) OR (trong van)) hoi. hieu va cham thuc dan thanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu cai ky ((tang van) or (trong van)) hoi. hieu va cham thuc dan thanh vi cua tre*.