Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
doanh khoa » toan khoa
mach thoi » cach thoi, cac thoi, sach hoi
luc doanh » muc doanh, luat doanh, luc canh
thoi tap » toi tap, hoc tap, thoi dai
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang 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.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat mach thoi tap, nghien cuu dong luc doanh khoa hoc ma hoi dan ((chan dan) or (chan doan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat mach thoi tap, nghien cuu dong luc doanh khoa hoc ma hoi dan ((chan dan) OR (chan doan))*.