Perhaps you should try some spelling variations:
thu canh » thuc hanh, thu cong, thu ban
canh hoc » anh hoc, cach hoc, danh hoc
cuu toan » cuu hoan, huu toan, cuu thanh
cua toan » xuan toan, cua thanh, cua doanh
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
van nhan » van phan, van thanh, danh nhan
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 hoc dai, nghien ((cuu toan) or (cua toan)) hoc dan khoa hoc xa hai van nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu canh hoc dai, nghien ((cuu toan) OR (cua toan)) hoc dan khoa hoc xa hai van nhan tai.
• Adding a wildcard symbol may retrieve word variants: thu canh hoc dai, nghien ((cuu toan) or (cua toan)) hoc dan khoa hoc xa hai van nhan tai*.