Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
thanh phan » thanh pho, thanh san, thanh toan
huu quang » vu quang, chu quang, huu tuan
van thanh » ban thanh, van tuan
mach hoc » cach hoc, dich hoc, anh hoc
bia khoa » da khoa
khoa hoc » hoa hoc
hoc bia » hoc gia, hoc giao, hoc giai
hoi van » hoi va, hoi dan, hai van
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 ((huu quang) OR (huu tung)) hoc bia khoa hoc xa hoi van thanh phan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat mach hoc tap, nghien ((huu quang) OR (huu tung)) hoc bia khoa hoc xa hoi van thanh phan".
• Adding a wildcard symbol may retrieve word variants: thuat mach hoc tap, nghien ((huu quang) OR (huu tung)) hoc bia khoa hoc xa hoi van thanh phan*.