Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
long thong » dong thong, cong thong, tong thong
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
chat long » chat luong, hai long, ha long
thong duc » hong duc, thong dung, thong nuoc
duc phan » dung phan, duc thang, duc phung

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((chieu sach) or (dieu hanh)) - hanh tinh chat long thong duc phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((chieu sach) OR (dieu hanh)) - hanh tinh chat long thong duc phan tu*.