Perhaps you should try some spelling variations:
phap toan » phap hoan, phap luan, phap phan
hoc mach » hoc mac, hoc sach, hoc tach
hoc cach » hoc cac, hoc sach, cuoc cach
van phap » ban phap, va phap, van phan
khoa hoc » hoa hoc
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: ((hoc mach) or (hoc cach)) hoc tap, nghien cuu van phap toan khoa hoc xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc mach) OR (hoc cach)) hoc tap, nghien cuu van phap toan khoa hoc xa hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: ((hoc mach) or (hoc cach)) hoc tap, nghien cuu van phap toan khoa hoc xa hoi va nhan dan*.