Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
manh dung » manh hung, manh tung, anh dung
dung phan » dung nhan, dung luan, dung ha
phan hang » phan dang, phan hong, pham hang
hang cong » dang cong, hang nong, bang cong
hanh phan » thanh phan, anh phan, hanh han
hieu van » hieu va, thien van, lieu va
cong tan » cong tac, cong san, cong thanh
tan hanh » tan thanh, tang hanh, toan hanh

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)) - manh dung phan hang cong tan hanh phan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((hieu van) OR (chieu sach)) - manh dung phan hang cong tan hanh phan*.