Perhaps you should try some spelling variations:
nhanh mang » nhanh lang, hanh mang, nhanh quang
nang cong » nang song, dang cong, bang cong
chi sach » chieu sach, co sach, moi sach
cong san » cong tac
mang va » mang vua, hang va, bang va
va nang » van nang, da nang, cam nang
than va » thanh va, toan va, han va
nhan va » nhan tai, nhan dan, nhan tao

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 (chinh sach)) - nhanh mang va nang cong san ((than va) or (nhan va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi sach) OR (chinh sach)) - nhanh mang va nang cong san ((than va) OR (nhan va)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chi sach) OR (chinh sach)) - nhanh mang va nang cong san ((than va) or (nhan va))".
• Adding a wildcard symbol may retrieve word variants: doi ((chi sach) OR (chinh sach)) - nhanh mang va nang cong san ((than va) or (nhan va))*.