Perhaps you should try some spelling variations:
doanh khoa » toan khoa
thuc cach » thuoc sach, truoc cach, thuc hanh
cach thuc » anh thuc, cac thu
hoc doanh » hoa doanh, hoc danh, hoc dan
thuc dap » thuc dan, thuc day, thuc tap
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan
nhan tai » hang tai, van tai, toan tai
hai van » thai van, ha van, hai tan
mo hoc » mon hoc, co hoc
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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

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