Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hanh thang » nhanh thang, thanh thang, hanh trang
nhung cong » dung cong, thong cong, hang cong
ban thanh » ban hanh, ban hang
thanh cha » thanh ha, thanh nha, thanh phan
hieu van » hieu va, thien van, lieu va
thang va » hang va, trang va, thong va
cong ban » cong bang, cong san, cong tan

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 va nhung cong ban thanh cha~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((hieu van) OR (chieu sach)) - hanh thang va nhung cong ban thanh cha*".