Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoa doanh » toan doanh, hoa dan
thu canh » thuc hanh, thu cong, thu ban
van nhan » van phan, van thanh, danh nhan
khoa hoc » hoa hoc
toan hoa » toan khoa, toan hoat, toan hoc
cuu toan » cuu hoan, cua toan, huu toan
thoi dai » hoc dai, hoi dap, hoi dan
thoi dap » hoi dap, thi dap, thoi dao
nhan tai » hang tai, van tai, toan tai
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 canh ((thoi dap) OR (thoi dai)), nghien cuu toan hoa doanh khoa hoc xa hai van nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu canh ((thoi dap) OR (thoi dai)), nghien cuu toan hoa doanh khoa hoc xa hai van nhan tai".
• Adding a wildcard symbol may retrieve word variants: thu canh ((thoi dap) OR (thoi dai)), nghien cuu toan hoa doanh khoa hoc xa hai van nhan tai*.