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 tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
mai hoi » mai khoi, dai hoi, mai doi
lai hoi » dai hoi, lai hoa, lai roi
va nhan » van nhan, ca nhan, va phan
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 tong hoc doanh khoa hoc ((mai hoi) or (lai hoi)) va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tim mach hoc tap, nghien cuu tong hoc doanh khoa hoc ((mai hoi) OR (lai hoi)) va nhan dan.
• Adding a wildcard symbol may retrieve word variants: tim mach hoc tap, nghien cuu tong hoc doanh khoa hoc ((mai hoi) or (lai hoi)) va nhan dan*.