Perhaps you should try some spelling variations:
sach rong » sach song, sach huong, sach dung
hanh khoa » hang khoa, anh khoa, hanh hoa
rong tac » trong tac, cong tac, dong tac
hoc hanh » hoc nhanh, hoc thanh, hoc anh
khoa hoc » hoa hoc
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, me hoi

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 rong tac, nghien cuu mon hoc hanh khoa hoc ((ma hoi) or (ma hoa)) luan van van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach rong tac, nghien cuu mon hoc hanh khoa hoc ((ma hoi) OR (ma hoa)) luan van van.
• Adding a wildcard symbol may retrieve word variants: te sach rong tac, nghien cuu mon hoc hanh khoa hoc ((ma hoi) or (ma hoa)) luan van van*.