Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
nganh khoa » nganh hoa, nganh khong, doanh khoa
mach hoc » cach hoc, dich hoc, anh hoc
dung cua » dung luan, dung cho
khoa hoc » hoa hoc
van hang » van khang, van hoang, van thang
hang tai » hang va, dung tai
mon hoc » toan hoc, dong hoc
hoi van » hoi va, hoi dan, hai van
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 ((mon hoc) or (dung cua)) nganh khoa hoc xa hoi van hang tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat mach hoc tap, nghien cuu ((mon hoc) OR (dung cua)) nganh khoa hoc xa hoi van hang tai.
• Adding a wildcard symbol may retrieve word variants: thuat mach hoc tap, nghien cuu ((mon hoc) or (dung cua)) nganh khoa hoc xa hoi van hang tai*.