Perhaps you should try some spelling variations:
hoa doanh » toan doanh, hoa dan
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
cuu dong » cuu cong, cuu tong, cuu long
dong luc » nang luc
luc toan » duc toan, quoc toan, luc tai
khoa hoc » hoa hoc
hoa danh » hoa dan, hop danh, hoc danh
nhan dan » phan dau, gian dan, nhan tai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu mach hoc tap, nghien cuu dong luc toan khoa hoc ma ((hoa danh) or (hoa doanh)) nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu mach hoc tap, nghien cuu dong luc toan khoa hoc ma ((hoa danh) OR (hoa doanh)) nhan dan.
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cuu dong luc toan khoa hoc ma ((hoa danh) or (hoa doanh)) nhan dan*.