Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
nganh hoa » thanh hoa, khanh hoa, danh hoa
mach hoc » cach hoc, dich hoc, anh hoc
dung cua » dung luan, dung cho
van nhan » van phan, van thanh, danh nhan
nhan tai » hang tai, van tai, toan 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 hoa hoc xa hoi van nhan 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 hoa hoc xa hoi van nhan tai.
• Adding a wildcard symbol may retrieve word variants: thuat mach hoc tap, nghien cuu ((mon hoc) or (dung cua)) nganh hoa hoc xa hoi van nhan tai*.