Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
nganh nong » nganh cong
hoa nganh » hoc nganh, khoi nganh, hoa doanh
mach hoc » cach hoc, dich hoc, anh hoc
cong hoa » dong hoa, dong hoc, hang hoa
nhan dan » phan dau, gian dan, nhan tai
tu mach » tu cach, tu manh, tu hach
dai hoi » dai hoc, dai hai, dai moi
cu nhan » ca nhan
ma hoi » mai hoi, xa hoi, ma hoa

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 thu cong hoa nganh nong thon ((ma hoi) or (dai hoi)) cu nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien thu cong hoa nganh nong thon ((ma hoi) OR (dai hoi)) cu nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien thu cong hoa nganh nong thon ((ma hoi) or (dai hoi)) cu nhan dan*.