Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
toc sach » hoc sach, doc sach, thuoc sach
lang van » dang van, hoang van, giang van
tang van » dang van, hoang van, trong van
hieu ve » hieu va, hieu van
ve tham » va tham, ve cham, vi tham
van anh » van thanh, van minh
di cua » dai cua, doi cua, de cua
cua te » cua tu
tuan » quan, tran, luan

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y ((lang van) or (tang van)) hoa. hieu ve tham thuc ((van anh) or (tuan anh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((lang van) OR (tang van)) hoa. hieu ve tham thuc ((van anh) OR (tuan anh)) di cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach y ((lang van) or (tang van)) hoa. hieu ve tham thuc ((van anh) or (tuan anh)) di cua te*.