Perhaps you should try some spelling variations:
mach hoc » cach hoc, dich hoc, anh hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
khoa hoc » hoa hoc
nhan dan » phan dau, nhan tai
gian dan » gian lang
su mach » su sach
hoc da » hoc dan, hoc dai, hoc dat
ma hoi » mai hoi, xa hoi, ma hoa

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 tong hoc da khoa hoc ma hoi va ((nhan dan) OR (gian dan))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su mach hoc tap, nghien cuu tong hoc da khoa hoc ma hoi va ((nhan dan) OR (gian dan))".
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu tong hoc da khoa hoc ma hoi va ((nhan dan) OR (gian dan))*.