Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoa doanh » toan doanh, hoa dan
cach thoi » cac thoi, cach thuc, cach noi
khoa hoc » hoa hoc
thoi dap » hoi dap, thoi dai, thi dap
cuu cong » cua cong, thu cong, cac cong
cong hoa » dong hoa, dong hoc, hang hoa
nhan dan » phan dau, gian dan, nhan tai
tu cach » tu cac
hoa cau » hoa cac, hoa dau, hoa mau
nhan va » nhan tai, nhan tao, phan van
xa hoa » xa khoa, xa hoi, ma hoa
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 hoa cau ((nhan dan) 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 hoa cau ((nhan dan) OR (nhan va)).
• Adding a wildcard symbol may retrieve word variants: tu cach thoi dap, nghien cuu cong hoa doanh khoa hoc xa hoa cau ((nhan dan) or (nhan va))*.