Perhaps you should try some spelling variations:
thuat cach » thuat sach, thuat canh, thuat mach
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
cach hoc » cach thuc, cach thoi, dich hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
khoa hoc » hoa hoc
chan dan » chan dang, nhan dan, chan nan
hoi dan » hoa dan, hoc dan, hoi dap
ma hoi » mai hoi, xa hoi, ma hoa
doanh » toanh, soanh, hoanh
doan » toan, soan, hoan

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