Perhaps you should try some spelling variations:
khoa khanh » hoa khanh, khoan thanh, kho khan
cach thoi » cac thoi, cach thuc, cach noi
khanh hoa » thanh hoa, hang hoa
dich hoc » sinh hoc, hinh hoc, tinh hoc
cuu toan » cuu hoan, cua toan, huu toan
nhan dan » phan dau, gian dan, nhan tai
va nhan » van nhan, ca nhan, va phan
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: te ((dich hoc) or (cach thoi)) tap, nghien cuu toan khoa khanh hoa hoc xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((dich hoc) OR (cach thoi)) tap, nghien cuu toan khoa khanh hoa hoc xa hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: te ((dich hoc) or (cach thoi)) tap, nghien cuu toan khoa khanh hoa hoc xa hoi va nhan dan*.