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 » dich hoc, anh hoc, bac hoc
cach hoc » cach thuc, cach thoi, dich hoc
cong hoc » dong hoc, cong hoa, cong coc
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 (cach hoc)) tap, nghien thu cong 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 (cach hoc)) tap, nghien thu cong hoc nganh khoa hoc mai hoi va nhan van.
• Adding a wildcard symbol may retrieve word variants: vi ((mach hoc) or (cach hoc)) tap, nghien thu cong hoc nganh khoa hoc mai hoi va nhan van*.