Perhaps you should try some spelling variations:
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong coc » cong cuoc, cong cac, cong co
coc hang » hoc hang, oc hang, moc hoang
thai van » thi van, thanh van, thai vung
van phan » van phong, van thanh, luan phan
phan van » pham van, thanh van, luan van
su mach » su sach
da thai » dao thai, do thai, ca thai

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 coc hang ((khoa hoc) OR (hoa hoc)) da thai van phan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su mach hoc tap, nghien cuu cong coc hang ((khoa hoc) OR (hoa hoc)) da thai van phan van".
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu cong coc hang ((khoa hoc) OR (hoa hoc)) da thai van phan van*.