Perhaps you should try some spelling variations:
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong coc » cong cuoc, cong cac, cong co
hoc lai » hoc dai, hoc bai, hoc lam
lai hoi » dai hoi, lai hoa, lai roi
va luan » vay luan, van luan, va quan
tim » time
toan » tran

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 coc ((doanh khoa) OR (toan khoa)) hoc lai hoi va luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tim mach hoc tap, nghien cuu cong coc ((doanh khoa) OR (toan khoa)) hoc lai hoi va luan van".
• Adding a wildcard symbol may retrieve word variants: tim mach hoc tap, nghien cuu cong coc ((doanh khoa) OR (toan khoa)) hoc lai hoi va luan van*.