Perhaps you should try some spelling variations:
doanh hoa » doanh khoa, doanh hoan, danh hoa
thanh van » thanh san, thanh toan, thanh phan
mach hoc » cach hoc, dich hoc, anh hoc
cuu dong » cuu cong, cuu tong, cuu long
co doanh » cho doanh, cao doanh, so doanh
va thanh » gia thanh, ban thanh, va tinh
su mach » su sach

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 tap, nghien cuu dong co doanh hoa ((hoc xa) OR (hoc ma)) hoi va thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su mach hoc tap, nghien cuu dong co doanh hoa ((hoc xa) OR (hoc ma)) hoi va thanh van".
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu dong co doanh hoa ((hoc xa) OR (hoc ma)) hoi va thanh van*.