Perhaps you should try some spelling variations:
mach hoc » cach hoc, dich hoc, anh hoc
dong hoc » dong luc
khoa hoc » hoa hoc
van nhan » van phan, van thanh, danh nhan
su mach » su sach
hoi van » hoi va, hoi dan, hai van
nhan va » nhan tai, nhan dan, nhan tao
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)) pham khoa hoc xa hoi van nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su mach hoc tap, nghien cuu ((dong hoc) OR (dong co)) pham khoa hoc xa hoi van nhan va".
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu ((dong hoc) OR (dong co)) pham khoa hoc xa hoi van nhan va*.