Perhaps you should try some spelling variations:
mach hoc » cach hoc, dich hoc, anh hoc
khoa hoc » hoa hoc
te mach » ke mach, te sach, tim mach
hoi cap » hoi dap, hoi cac, hoi cau
cap han » cap phan, cap can, cap hay
han van » phan van, nhan van, hanh van
mo hoc » mon hoc
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "te mach hoc tap, nghien cuu ((mo hoc) OR (co hoc)) da khoa hoc ma hoi cap han van~".
• Adding a wildcard symbol may retrieve word variants: te mach hoc tap, nghien cuu ((mo hoc) OR (co hoc)) da khoa hoc ma hoi cap han van*.