Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thong cong » trong cong, tong cong, thong thong
doi chieu » doc hieu, doi chi, mot chieu
hanh dinh » thanh dinh, hinh dinh, hanh tinh
dang cong » dung cong
trinh han » trinh quan
han dac » ban dac, han dau, tan dac

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - hanh dinh van ((thong cong) or (dang cong)) trinh han dac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh dinh van ((thong cong) OR (dang cong)) trinh han dac*.