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