Perhaps you should try some spelling variations:
doanh khoa » toan khoa
thuc cach » thuoc sach, truoc cach, thuc hanh
cach thoi » cac thoi, cach thuc, cach noi
hoc doanh » hoa doanh, hoc danh, hoc dan
thoi dap » hoi dap, thoi dai, thi dap
cuu cong » cua cong, thu cong, cac cong
khoa hoc » hoa hoc
van nhan » van phan, van thanh, danh nhan
nhan dan » phan dau, gian dan, nhan tai
cuu mon » cuu mo, cuu mot, cuu tong
hai van » thai van, ha van, hai tan
ma hai » ta hai, va hai, xa hai

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 thoi dap, nghien ((cuu mon) or (cuu cong)) hoc doanh khoa hoc ma hai van nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuc cach thoi dap, nghien ((cuu mon) OR (cuu cong)) hoc doanh khoa hoc ma hai van nhan dan.
• Adding a wildcard symbol may retrieve word variants: thuc cach thoi dap, nghien ((cuu mon) or (cuu cong)) hoc doanh khoa hoc ma hai van nhan dan*.