Perhaps you should try some spelling variations:
sach hoc » cach hoc, sach hoi, mach hoc
chu luan » cu luan, chu xuan, chu tuan
anh hoc » sinh hoc, benh hoc, hinh hoc
hoc san » hoc dan, toc san, hoc can
san hoa » san khoa, van hoa, son hoa
cuu co » huu co, cua co, cuu mo
xa ho » xa hoa, xa hoc, xa pho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach hoc) or (anh hoc)) tap, nghien cuu co hoc san hoa hoc ((xa ho) OR (xa hoi)) chu luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoc) OR (anh hoc)) tap, nghien cuu co hoc san hoa hoc ((xa ho) OR (xa hoi)) chu luan van.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach hoc) or (anh hoc)) tap, nghien cuu co hoc san hoa hoc ((xa ho) OR (xa hoi)) chu luan van".
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) or (anh hoc)) tap, nghien cuu co hoc san hoa hoc ((xa ho) OR (xa hoi)) chu luan van*.