Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
nhan van » nhan dan, nhan va, phan van
mai tai » mai thai, dai tai, mai tat
va nhan » van nhan, ca nhan, va phan
bach » sach, cach, bac

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach mai tai, nghien cuu cong hoc doanh khoa ((hoc xa) OR (hoc ma)) hoi va nhan van~".
• Adding a wildcard symbol may retrieve word variants: vu bach mai tai, nghien cuu cong hoc doanh khoa ((hoc xa) OR (hoc ma)) hoi va nhan van*.