Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoa » dong hoa, dong hoc, hang hoa
hoa toan » hoa tan, hop toan, hoa than
khoa hoc » hoa hoc
su mach » su sach
hoi van » hoi va, hoi dan, hoi han
hai van » thai van, ha van, hai tan
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: su mach hoc tap, nghien cuu cong hoa toan khoa hoc xa ((hoi van) or (hai van)) thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien cuu cong hoa toan khoa hoc xa ((hoi van) OR (hai van)) thanh van.
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu cong hoa toan khoa hoc xa ((hoi van) or (hai van)) thanh van*.