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
nhan taon » nhan trong, nhan thong, nhan tuong
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
nhan tao » nhan tai, nhan dan
tu cach » tu cac
hoa cau » hoa cac, hoa dau, hoa mau
hoc xa » hoc ma
xa hoa » xa khoa, xa hoi, ma hoa

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 taon) or (nhan tao))~.
• 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 taon) OR (nhan tao)).
• Adding a wildcard symbol may retrieve word variants: tu cach thoi dap, nghien cuu cong hoa doanh khoa hoc xa hoa cau ((nhan taon) or (nhan tao))*.