Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
dan thanh » dang thanh, danh thanh, ban thanh
thanh va » thanh van, hanh va, thanh ha
thuc dan » thuc hanh, hoc dan, thuc vat
cau treo » cau theo, cau tren, cau triet
hieu tu » chieu tu, hieu tuc, hien tu
tu cham » toc cham, thi cham
sach tu » sach thu, cach tu, sach ty
hoa hoi » khoa hoi, hoa doi, hoc hoi
cua tre » cua te, cuu tre, cua triet
so sach » so sanh, bo sach, co sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tu dong ((hoa hoi) or (hoa hoc)). hieu tu cham thuc dan thanh va ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tu dong ((hoa hoi) OR (hoa hoc)). hieu tu cham thuc dan thanh va ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: so sach tu dong ((hoa hoi) or (hoa hoc)). hieu tu cham thuc dan thanh va ((cua tre) or (cau treo))*.