Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
sach moi » sach doi, sach hoi, bach mai
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
hai benh » tai benh, hai binh, hap benh
nhan dan » phan dau, gian dan, nhan tai
ma hai » ta hai, va hai, xa hai

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach hoc) OR (sach moi)) tap, nghien cuu cong hoc nganh khoa hoc ma hai benh nhan dan~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) OR (sach moi)) tap, nghien cuu cong hoc nganh khoa hoc ma hai benh nhan dan*.