Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
cach hoc » cach thuc, cach thoi, dich hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
khoa hoc » hoa hoc
nhan dan » gian dan, nhan tai
phan dau » phan tu, hang dau
su cach » su sach, tu cach, su cac
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cach hoc tap, nghien cuu tong hoc doanh khoa hoc mai hoi va ((nhan dan) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cach hoc tap, nghien cuu tong hoc doanh khoa hoc mai hoi va ((nhan dan) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: su cach hoc tap, nghien cuu tong hoc doanh khoa hoc mai hoi va ((nhan dan) or (phan dau))*.