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 tap » toi tap, hoc tap, thoi dai
khoa hoc » hoa hoc
cac nhan » ca nhan, cac nha, cam nhan
nhan dan » phan dau, gian dan, nhan tai
tu cach » tu cac
cuu mon » cuu mo, cuu cong, cuu tong
cuu mot » cua mot, cuu mo, huu mot
hoi cac » hoc cac, voi cac, hoa cac
ma hoi » mai hoi, 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 tap, nghien ((cuu mon) or (cuu mot)) hoa doanh khoa hoc ma hoi cac nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach thoi tap, nghien ((cuu mon) OR (cuu mot)) hoa doanh khoa hoc ma hoi cac nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu cach thoi tap, nghien ((cuu mon) or (cuu mot)) hoa doanh khoa hoc ma hoi cac nhan dan*.