Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
toc sach » hoc sach, doc sach, thuoc sach
lang van » dang van, tang van, hoang van
va danh » va dinh, va dan, va hanh
va xanh » va hanh, va anh, va banh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
van hoi » van hoa, van hoc, van hoe
cua tu » cua tuc, cua su, cua cu

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: toc sach _ lang van hoi. hieu vu cham thuc ((va xanh) OR (va danh)) di ((cua te) OR (cua tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach _ lang van hoi. hieu vu cham thuc ((va xanh) OR (va danh)) di ((cua te) or (cua tu))~".
• Adding a wildcard symbol may retrieve word variants: toc sach _ lang van hoi. hieu vu cham thuc ((va xanh) OR (va danh)) di ((cua te) or (cua tu))*.