Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
mach hoc » cach hoc, anh hoc, bac hoc
dich hoc » sinh hoc, hinh hoc, tinh hoc
thu dong » thuy dong, tu dong, thu cong
dong hoc » dong co, dong luc
khoa hoc » hoa hoc
nhan van » nhan dan, nhan va, phan van
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
va nhan » van nhan, ca nhan, va phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: vi ((mach hoc) or (dich hoc)) tap, nghien thu dong hoc nganh khoa hoc mai hoi va nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vi ((mach hoc) OR (dich hoc)) tap, nghien thu dong hoc nganh khoa hoc mai hoi va nhan van.
• Adding a wildcard symbol may retrieve word variants: vi ((mach hoc) or (dich hoc)) tap, nghien thu dong hoc nganh khoa hoc mai hoi va nhan van*.