Perhaps you should try some spelling variations:
ngan cong » nganh cong, nganh nong, ngan hang
sach hoi » sach moi, cach thoi, hoach hoi
sach doi » sach moi, sach dao, sach bai
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang luc
luc ngan » luc nganh, luc nhan, luat ngan
cong hoa » dong hoa, dong hoc, hang hoa
phan tao » nhan tao, phan tap, phan tan
hoa mai » hoa dai, hoa may, hoa moi
mai hoi » mai khoi, dai hoi, lai hoi
va phan » van phan, va phat, va phap

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 hoi) or (sach doi)) tap, nghien cuu dong luc ngan cong hoa mai hoi va phan tao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoi) OR (sach doi)) tap, nghien cuu dong luc ngan cong hoa mai hoi va phan tao.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoi) or (sach doi)) tap, nghien cuu dong luc ngan cong hoa mai hoi va phan tao*.