Perhaps you should try some spelling variations:
hoa doanh » toan doanh, hoa dan
den thanh » de thanh, dinh thanh, dong thanh
thanh van » thanh san, thanh toan, thanh phan
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, cho doanh
khoa hoc » hoa hoc
xa thai » ca thai, a thai, da thai
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: thu mach hoc tap, nghien cuu cong ((so doanh) or (hoa doanh)) khoa hoc xa thai den thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu mach hoc tap, nghien cuu cong ((so doanh) OR (hoa doanh)) khoa hoc xa thai den thanh van.
• Adding a wildcard symbol may retrieve word variants: thu mach hoc tap, nghien cuu cong ((so doanh) or (hoa doanh)) khoa hoc xa thai den thanh van*.