Perhaps you should try some spelling variations:
hoc doanh » hoa doanh, hoc danh, hoc dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
ban thoi » ban thi, ban thai, ban toi
thoi dap » hoi dap, thoi dai, thi dap
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, tin hoc
nhan dan » phan dau, gian dan
nhan tai » hang tai, van tai, toan tai
thu ban » thu hang
hai van » thai van, ha van, hai tan
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: thu ban thoi dap, nghien cuu toan hoc doanh hoa hoc xa hai van ((nhan dan) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ban thoi dap, nghien cuu toan hoc doanh hoa hoc xa hai van ((nhan dan) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: thu ban thoi dap, nghien cuu toan hoc doanh hoa hoc xa hai van ((nhan dan) or (nhan tai))*.