Perhaps you should try some spelling variations:
chuc doanh » chuc danh, cho doanh, cac doanh
doanh khoa » toan khoa
cong chuc » cong thuc, cong cu, cong cua
sach hoc » cach hoc, sach hoi, mach hoc
cuu cong » cua cong, thu cong, cac cong
khoa hoc » hoa hoc
van nhan » van phan, van thanh, danh nhan
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
ma hoi » mai hoi, xa hoi, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoc tap, nghien cuu cong chuc doanh khoa hoc ((ma hoi) OR (ma hoa)) van nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach hoc tap, nghien cuu cong chuc doanh khoa hoc ((ma hoi) OR (ma hoa)) van nhan dan".
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu cong chuc doanh khoa hoc ((ma hoi) OR (ma hoa)) van nhan dan*.