Perhaps you should try some spelling variations:
doanh khoa » toan khoa
cach thoi » cac thoi, cach thuc, cach noi
hoc doanh » hoa doanh, hoc danh, hoc dan
thoi tap » toi tap, hoc tap, thoi dai
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
su cach » su sach, tu cach, su cac
nhan va » nhan tai, nhan tao, phan van
mo hoc » mon hoc, co hoc
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau

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 thoi tap, nghien cuu mo hoc doanh khoa hoc xa hoi ca ((nhan dan) or (nhan va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cach thoi tap, nghien cuu mo hoc doanh khoa hoc xa hoi ca ((nhan dan) OR (nhan va)).
• Adding a wildcard symbol may retrieve word variants: su cach thoi tap, nghien cuu mo hoc doanh khoa hoc xa hoi ca ((nhan dan) or (nhan va))*.