Perhaps you should try some spelling variations:
khoa nganh » khoi nganh, hoc nganh
nganh nong » nganh cong
nong thong » nong thon, dong thong, cong thong
hoan khoa » toan khoa, hoa khoa, han khoa
mach hoc » cach hoc, dich hoc, anh hoc
cuu hoan » luu hoang, cuu van, cuu khoa
thong xa » thong xay, thong va, thong ha
su mach » su sach
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: su mach hoc tap, nghien cuu hoan khoa nganh nong thong xa hoi va ((han va) or (hang va))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien cuu hoan khoa nganh nong thong xa hoi va ((han va) OR (hang va)).
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu hoan khoa nganh nong thong xa hoi va ((han va) or (hang va))*.