Perhaps you should try some spelling variations:
mach hoc » cach hoc, dich hoc, anh hoc
dong hoc » dong luc
pho khoa » phu khoa, pha khoa, tho khoa
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
su mach » su sach
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: su mach hoc tap, nghien cuu ((dong hoc) or (dong co)) pho khoa hoc xa hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien cuu ((dong hoc) OR (dong co)) pho khoa hoc xa hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu ((dong hoc) or (dong co)) pho khoa hoc xa hoi va nhan dan*.