Perhaps you should try some spelling variations:
thuat cach » thuat sach, thuat canh, thuat mach
doanh khoa » toan khoa
cach hoc » cach thuc, cach thoi, dich hoc
cuu dong » cuu cong, cuu tong, cuu long
co doanh » cho doanh, cao doanh, so doanh
khoa hoc » hoa hoc
chan dan » chan doan, chan dang, nhan dan
hoi dan » hoa dan, hoi dap, thoi dai

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: "thuat cach hoc tap, nghien cuu dong co doanh khoa hoc ma ((hoi dan) OR (hoc dan)) chan dan~".
• Adding a wildcard symbol may retrieve word variants: thuat cach hoc tap, nghien cuu dong co doanh khoa hoc ma ((hoi dan) OR (hoc dan)) chan dan*.