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 dap » hoi dap, thoi dai, thi dap
khoa hoc » hoa hoc
tu cach » tu cac
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoc cau » hoc cao, hoc cac, hoc can
nha van » nha lanh
nhan va » nhan tai, nhan dan, nhan tao
hoc xa » hoc ma
xa hoc » xa hoi, va hoc, xa 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 mon hoc doanh khoa hoc xa hoc cau ((nha van) or (nhan va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach thoi dap, nghien cuu mon hoc doanh khoa hoc xa hoc cau ((nha van) OR (nhan va)).
• Adding a wildcard symbol may retrieve word variants: tu cach thoi dap, nghien cuu mon hoc doanh khoa hoc xa hoc cau ((nha van) or (nhan va))*.