Perhaps you should try some spelling variations:
doanh khoa » toan khoa
van thanh » ban thanh, van tuan
thu mach » thu sach, thuat mach, thu hoach
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
so doanh » so danh, su doanh, hoa doanh
khoa hoc » hoa hoc
mau thai » mau than, mau thay, mau thuan
mai thai » mai thi, mai thanh, mai thach
cong so » cong san, cong hoa

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 cong so doanh khoa hoc ((mau thai) OR (mai thai)) van thanh pho~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu mach hoc tap, nghien cuu cong so doanh khoa hoc ((mau thai) OR (mai thai)) van thanh pho".
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cuu cong so doanh khoa hoc ((mau thai) OR (mai thai)) van thanh pho*.