Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh nong » nganh cong
hoc nganh » hoc nhanh
van thanh » ban thanh, van tuan
sach hoi » sach doi, sach moi, cach thoi
nong hop » tong hop, cong hop, nong thon
van nhan » van phan, danh nhan, van khanh
su sach » so sach, vu sach
hoi tap » hoi dap, hoc tap, hoi tai
mot hoc » mon hoc, mo hoc, mot goc
hop tap » hoc tap, hop tac, hop tai
tap hai » tap bai, tap dai, tai hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach hoi tap, nghien cua mot hoc nganh nong hop tap hai ((van nhan) or (van thanh)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoi tap, nghien cua mot hoc nganh nong hop tap hai ((van nhan) OR (van thanh)) van.
• Adding a wildcard symbol may retrieve word variants: su sach hoi tap, nghien cua mot hoc nganh nong hop tap hai ((van nhan) or (van thanh)) van*.