Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
thanh phan » thanh pho, thanh san, thanh toan
soc doanh » so doanh, hoa doanh, voi doanh
van thanh » ban thanh, van tuan
mach hoc » cach hoc, dich hoc, anh hoc
cuu long » cuu cong, cuu tong, cuu nang
long soc » lon soc, luong suc, cong so
thai van » thi van, thanh van, thai vung
xa thai » ca thai, a thai, da thai

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

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