Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
thanh hoa » thanh pho
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong cau » cong cu, cong chuc, thong cau
hang hoa » hang khoa, hang va, dong hoa
va nhan » van nhan, ca nhan, va phan
nhan va » nhan tai, nhan dan, nhan tao
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: thuat mach hoc tap, nghien cuu cong cau ((thanh hoa) or (hang hoa)) hoc xa hoi va nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat mach hoc tap, nghien cuu cong cau ((thanh hoa) OR (hang hoa)) hoc xa hoi va nhan va.
• Adding a wildcard symbol may retrieve word variants: thuat mach hoc tap, nghien cuu cong cau ((thanh hoa) or (hang hoa)) hoc xa hoi va nhan va*.