Perhaps you should try some spelling variations:
doanh khoa » toan khoa
cuu trong » cuu tong, chu trong, luu trong
trong hoc » truong hoc, tuong hoc, thong hoc
hoc doanh » hoa doanh, hoc danh, hoc dan
sach hoc » cach hoc, sach hoi, mach hoc
dap nhan » dap nha, dac nhan, dam nhan
nhan dan » phan dau, gian dan, nhan tai
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach hoc tap, nghien cuu trong hoc doanh khoa ((hoc xa) or (hoc ma)) hoi dap nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoc tap, nghien cuu trong hoc doanh khoa ((hoc xa) OR (hoc ma)) hoi dap nhan dan.
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien cuu trong hoc doanh khoa ((hoc xa) or (hoc ma)) hoi dap nhan dan*.