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

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 van thanh va ((cua tre) OR (cuu tre))~.
• 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 van thanh va ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu dong ((hoa hoi) or (hoa hoc)). hieu tu cham thuc van thanh va ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sach tu dong ((hoa hoi) or (hoa hoc)). hieu tu cham thuc van thanh va ((cua tre) OR (cuu tre))*.