Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
va luan » vay luan, van luan, va quan
tim » time

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

• Performing a fuzzy search may retrieve terms with similar spellings: tim mach hoc tap, nghien cuu cong hoc doanh khoa hoc mai hoi ((va luan) or (ly luan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tim mach hoc tap, nghien cuu cong hoc doanh khoa hoc mai hoi ((va luan) OR (ly luan)) van.
• Adding a wildcard symbol may retrieve word variants: tim mach hoc tap, nghien cuu cong hoc doanh khoa hoc mai hoi ((va luan) or (ly luan)) van*.