Perhaps you should try some spelling variations:
nganh nong » nganh cong
sach doi » sach hoi, sach moi, sach dao
dong hoc » dong co
dong luc » nang luc
nong hoc » nang hoc, nong thon, duong hoc
cua nhan » ca nhan, cua ngan, cua nha
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
doi dap » hoi dap, doi dau, do dap
hoi cua » hoi chuc
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 sach doi dap, nghien cuu ((dong hoc) or (dong luc)) nganh nong hoc ma hoi cua nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi dap, nghien cuu ((dong hoc) OR (dong luc)) nganh nong hoc ma hoi cua nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach doi dap, nghien cuu ((dong hoc) or (dong luc)) nganh nong hoc ma hoi cua nhan dan*.