Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
hang cong » dang cong, hang nong, bang cong
chi sach » chinh sach, chieu sach, moi sach
cong san » cong tac
san than » sang than, san thanh, ban than
co sach » bo sach, cuon sach, hoc sach
mang va » mang vua, hang va, bang va
va hang » van hang, va nang, va lang
than ma » than man, than va, khan ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chi sach) OR (co sach)) - nhanh mang va hang cong san than ma~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi sach) OR (co sach)) - nhanh mang va hang cong san than ma".
• Adding a wildcard symbol may retrieve word variants: doi ((chi sach) OR (co sach)) - nhanh mang va hang cong san than ma*.