Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
thanh phan » thanh pho, thanh san, thanh toan
huu quang » vu quang, huu tung, chu quang
quang hoc » quang hoi, quang huy, dung hoc
van thanh » ban thanh, van tuan
tach hoc » mach hoc, tach hon, thanh hoc
cach hoc » cach thuc, cach thoi, dich 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 ((tach hoc) OR (cach hoc)) tap, nghien huu quang hoc bia khoa hoc xa hoi van thanh phan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((tach hoc) OR (cach hoc)) tap, nghien huu quang hoc bia khoa hoc xa hoi van thanh phan".
• Adding a wildcard symbol may retrieve word variants: thuat ((tach hoc) OR (cach hoc)) tap, nghien huu quang hoc bia khoa hoc xa hoi van thanh phan*.