Perhaps you should try some spelling variations:
sach dong » sach dung, sach song, sach rong
hanh khoa » anh khoa, hanh hoa, han khoa
hang khoa » dung khoa
dong tac » cong tac, dong tai, dong bac
hoi luan » hoa luan, hoc luan, khoa luan
te sach » toc sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
van van » van ban, tan van, san van
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach dong tac, nghien cuu mon hoc ((hanh khoa) OR (hang khoa)) hoc ma hoi luan van van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach dong tac, nghien cuu mon hoc ((hanh khoa) OR (hang khoa)) hoc ma hoi luan van van".
• Adding a wildcard symbol may retrieve word variants: te sach dong tac, nghien cuu mon hoc ((hanh khoa) OR (hang khoa)) hoc ma hoi luan van van*.