Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
phan khoa » pham khoa, nhan khoa, phan hoa
mach hoc » cach hoc, dich hoc, anh hoc
cuu dong » cuu tong, cuu long, luu dong
cuu cong » cua cong, thu cong, cac cong
hoc phan » hoc dan, hoc pho
khoa hoc » hoa hoc
gian dan » gian lang
va gian » va gianh, van gian, va giai
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 dong) or (cuu cong)) hoc phan khoa hoc xa hoi va gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat mach hoc tap, nghien ((cuu dong) OR (cuu cong)) hoc phan khoa hoc xa hoi va gian dan.
• Adding a wildcard symbol may retrieve word variants: thuat mach hoc tap, nghien ((cuu dong) or (cuu cong)) hoc phan khoa hoc xa hoi va gian dan*.