Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
hoc danh » hoc dan, hoc anh, hoc hanh
danh hoa » thanh hoa, khanh hoa, nganh hoa
hoi danh » hop danh, hoi dan, hoi dang
nhan tai » hang tai, toan tai
van tai » von tai, van tuan
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: thuat mach hoc tap, nghien cuu cong hoc danh hoa hoc xa hoi danh ((nhan tai) or (van tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat mach hoc tap, nghien cuu cong hoc danh hoa hoc xa hoi danh ((nhan tai) OR (van tai)).
• Adding a wildcard symbol may retrieve word variants: thuat mach hoc tap, nghien cuu cong hoc danh hoa hoc xa hoi danh ((nhan tai) or (van tai))*.