Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh thang » nhanh thang, thanh thang, hanh trang
thang van » tang van, thanh van, thong van
dang cong » dung cong
cong bang » cuong bang, dong bang, hong bang
bang hanh » bang thanh, ban hanh, bang hinh
hanh phan » thanh phan, anh phan, hanh han
hieu van » hieu va, thien van, lieu va
van dang » van dong, van dung, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((hieu van) or (chieu sach)) - hanh thang van dang cong bang hanh phan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((hieu van) OR (chieu sach)) - hanh thang van dang cong bang hanh phan*.