Perhaps you should try some spelling variations:
dong thuoc » dung thuoc, dang thuoc, don thuoc
hoc nganh » hoc nhanh
cong thuc » cong tac
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
nhan van » nhan dan, nhan va, phan van
so mach » so sach, tao mach, kon mach
va nhan » van nhan, ca nhan, va phan
va hoi » xa hoi, va hoc, va hoa

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

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