Perhaps you should try some spelling variations:
nganh nong » nganh cong
hoc nganh » hoc nhanh
mach hoc » cach hoc, dich hoc, anh hoc
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
tu mach » tu cach, tu manh, tu hach
thon xa » thong xa, thoi xa, thong xay
han va » hanh va, nhan va, ban va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu mach hoc tap, nghien cuu toan hoc nganh nong thon xa hoi va ((han va) or (hang va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu toan hoc nganh nong thon xa hoi va ((han va) OR (hang va)).
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu toan hoc nganh nong thon xa hoi va ((han va) or (hang va))*.