Perhaps you should try some spelling variations:
hanh thoi » hanh thuoc, nhanh thai, hanh noi
hoc doanh » hoa doanh, hoc danh, hoc dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
thoi dap » hoi dap, thoi dai, thi dap
cuu toan » cua toan, huu toan, cuu thanh
cuu hoan » luu hoang, cuu van, cuu khoa
tan nhan » tran nhan, tao nhan, van nhan
nhan tai » hang tai, van tai, toan tai
hai tan » hai van, hai quan
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi
thuc » thu

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

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