Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tinh bang » tinh sang, tinh lang, tinh quang
sang sach » mang sach, ban sach, sang tac
cua nhung » va nhung
hoc sang » hoc bang, hoc tang, hoc hang
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap
anh son » anh dong, tinh son

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sang sach - ((anh son) or (tinh bang)) cua nhung cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sang sach - ((anh son) OR (tinh bang)) cua nhung cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc sang sach - ((anh son) or (tinh bang)) cua nhung cong dan than cau*.