Perhaps you should try some spelling variations:
doanh khoa » toan khoa
cach thoi » cac thoi, cach thuc, cach noi
hoa doanh » toan doanh, hoa dan
thoi dap » hoi dap, thoi dai, thi dap
cuu cong » cua cong, thu cong, cac cong
cong hoa » dong hoa, dong hoc, hang hoa
khoa hoc » hoa hoc
khoa dau » khoan dau, hoa dau, khoi dau
nhan van » nhan dan, phan van, nha van
tu cach » tu cac
xa khoa » da khoa, bia khoa, tai khoa
nhan va » nhan tai, nhan dan, nhan tao
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach thoi dap, nghien cuu cong hoa doanh khoa hoc xa khoa dau ((nhan van) or (nhan va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach thoi dap, nghien cuu cong hoa doanh khoa hoc xa khoa dau ((nhan van) OR (nhan va)).
• Adding a wildcard symbol may retrieve word variants: tu cach thoi dap, nghien cuu cong hoa doanh khoa hoc xa khoa dau ((nhan van) or (nhan va))*.