Perhaps you should try some spelling variations:
doanh khoa » toan khoa
danh thanh » dinh thanh, dang thanh, nhanh thanh
hoa doanh » toan doanh, hoa dan
mach hoc » cach hoc, dich hoc, bac hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoa » dong hoc, dong co
khoa hoc » hoa hoc
hoi danh » hop danh, hoi dan, hoc danh
anh hoc » sinh hoc, benh hoc, hinh hoc
hoc xa » hoc ma

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

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