Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc, cach noi
mach hoc » cach hoc, dich hoc, anh hoc
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
dan nhan » danh nhan, dan chan, van nhan
nhan tai » hang tai, van tai, toan tai
van hoc » van hoa
hoi dan » hoa dan, hoi dap, thoi dai
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: tu ((cach thoi) or (mach hoc)) tap, nghien cuu van hoc dan khoa hoc xa hoi dan nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cach thoi) OR (mach hoc)) tap, nghien cuu van hoc dan khoa hoc xa hoi dan nhan tai.
• Adding a wildcard symbol may retrieve word variants: tu ((cach thoi) or (mach hoc)) tap, nghien cuu van hoc dan khoa hoc xa hoi dan nhan tai*.