Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
doanh khoa » toan khoa
thai muong » hai duong, thai cong, thai vung
thai dong » thai cong, thai long, ha dong
thanh van » thanh san, thanh toan, thanh phan
mach hoc » cach hoc, dich hoc, anh hoc
so doanh » so danh, su doanh, hoa doanh
khoa hoc » hoa hoc
cong so » cong san, cong hoa
hoc ca » hoc cao, hoc cua, hoc cac

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 thu cong so doanh khoa hoc ca ((thai dong) or (thai muong)) thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat mach hoc tap, nghien thu cong so doanh khoa hoc ca ((thai dong) OR (thai muong)) thanh van.
• Adding a wildcard symbol may retrieve word variants: thuat mach hoc tap, nghien thu cong so doanh khoa hoc ca ((thai dong) or (thai muong)) thanh van*.