Perhaps you should try some spelling variations:
doanh khoa » toan khoa
xanh khoa » anh khoa, nganh khoa, xanh khong
sach hoc » cach hoc, sach hoi, mach hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong luc » dong luc, tong cuc, truong luc
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 khoa) OR (doanh khoa)) hoc ma ha doanh nhan dan~".
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cuu tong luc ((xanh khoa) OR (doanh khoa)) hoc ma ha doanh nhan dan*.