Perhaps you should try some spelling variations:
luc nganh » luc ngan, chuc nganh, luat nganh
sach hoc » cach hoc, sach hoi, mach hoc
cuu tong » cuu cong, cuu tinh, huu tung
luc xanh » luc canh, tuoc xanh, suc manh
khoa hoc » hoa hoc
ha doanh » hoa doanh, nha doanh, va doanh
nhan dan » phan dau, gian dan, nhan tai
te sach » toc sach
ma ha » ma hoa, mai ha, my ha

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: "te sach hoc tap, nghien cuu tong ((luc xanh) OR (luc nganh)) khoa hoc ma ha doanh nhan dan~".
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cuu tong ((luc xanh) OR (luc nganh)) khoa hoc ma ha doanh nhan dan*.