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 » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
van nhan » van thanh, danh nhan, van khanh
van phan » van phong, van thanh, luan phan
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 dai, nghien cuu toan hoc dan khoa hoc xa hai ((van nhan) OR (van phan)) tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu canh thoi dai, nghien cuu toan hoc dan khoa hoc xa hai ((van nhan) OR (van phan)) tai".
• Adding a wildcard symbol may retrieve word variants: thu canh thoi dai, nghien cuu toan hoc dan khoa hoc xa hai ((van nhan) OR (van phan)) tai*.