Perhaps you should try some spelling variations:
canh thoi » cach thoi, hanh thoi, anh tho
thu canh » thuc hanh, thu cong, thu ban
thoi dai » hoc dai, hoi dap, hoi dan
cuu toan » cua toan, huu toan, cuu thanh
cuu hoan » luu hoang, cuu van, cuu khoa
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
tan nhan » tran nhan, tao nhan, van nhan
nhan tai » hang tai, van tai, toan tai
hoi tan » hoi dan, hoi tai, hai tan
hoc xa » hoc ma

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 dai, nghien ((cuu toan) or (cuu hoan)) hoc dan khoa hoc xa hoi tan nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu canh thoi dai, nghien ((cuu toan) OR (cuu hoan)) hoc dan khoa hoc xa hoi tan nhan tai.
• Adding a wildcard symbol may retrieve word variants: thu canh thoi dai, nghien ((cuu toan) or (cuu hoan)) hoc dan khoa hoc xa hoi tan nhan tai*.