Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
thanh lap » thanh san, phan lap, thanh hai
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, ban thanh, va tinh
hang cau » hang dau, hang ca, nhung cau
cua tre » cua te, cuu tre, cua triet
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach thu, xach tay
hieu ve » hieu va, hieu van
sach tu » sach thu, cach tu, sach uu
ve nam » he nam, va nam, le nam

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 ((sach ty) OR (sach tu)) hang cau hoi. hieu ve nam thuc va thanh lap ((cua tre) OR (cau triet))~.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tu)) hang cau hoi. hieu ve nam thuc va thanh lap ((cua tre) or (cau triet))*.