Perhaps you should try some spelling variations:
nganh long » nganh cong, nganh nong, nganh khong
long thuoc » luong thuoc, dong thuoc, khong thuoc
hoc nganh » hoc nhanh
mach hoc » cach hoc, dich hoc, anh hoc
thuoc va » thuc va, thuoc ma, thuong va
van nhan » van phan, van thanh, danh nhan
so mach » so sach, tao mach, kon mach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va nhan » ca nhan, va phan, va nha
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 mon hoc nganh long thuoc va hoi ((va nhan) or (van nhan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so mach hoc tap, nghien cuu mon hoc nganh long thuoc va hoi ((va nhan) OR (van nhan)) van.
• Adding a wildcard symbol may retrieve word variants: so mach hoc tap, nghien cuu mon hoc nganh long thuoc va hoi ((va nhan) or (van nhan)) van*.