Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
nganh nong » nganh cong
hoc nganh » hoc nhanh
thanh van » thanh san, thanh toan, thanh phan
mach hoc » cach hoc, dich hoc, anh hoc
nong hoc » dong hoc, nang hoc, nong thon
khoa cac » khoa cam, khoa can, khoa cap
tu mach » tu cach, tu manh, tu hach
hoa cac » hoa chat, chon cac
huu mo » huu mot, huu co, huu ho
mo hoc » mon hoc, co hoc
hoc da » hoc dan, hoc dai, hoc dat

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 huu mo hoc nganh nong hoc da ((khoa cac) OR (hoa cac)) thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu mach hoc tap, nghien huu mo hoc nganh nong hoc da ((khoa cac) OR (hoa cac)) thanh van".
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien huu mo hoc nganh nong hoc da ((khoa cac) OR (hoa cac)) thanh van*.