Perhaps you should try some spelling variations:
sach hoc » cach hoc, sach hoi, mach hoc
te sach » toc sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoc tan » hoc tang, hoc dan, hoc tai
tan hoa » van hoa, tap hoa, tan ha
hoc xa » hoc ma
xa hoa » xa khoa, xa hoi, ma hoa

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach hoc tap, nghien cuu mon hoc tan hoa hoc xa hoa ((luan hoan) OR (luan van)) van~".
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cuu mon hoc tan hoa hoc xa hoa ((luan hoan) OR (luan van)) van*.