Perhaps you should try some spelling variations:
sach dong » sach dung, sach song, sach rong
danh khoa » doanh khoa, anh khoa, danh hoa
dong tac » cong tac, dong tai, dong bac
cuu cong » cua cong, thu cong, cac cong
hoc danh » hoc dan, hoc anh, hoc hanh
khoa hoc » hoa hoc
hoi luan » hoa luan, hoc luan, khoa luan
te sach » toc sach
cuu mon » cuu mo, cuu mot, cuu tong
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) or (cuu cong)) hoc danh khoa hoc ma hoi luan van van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach dong tac, nghien ((cuu mon) OR (cuu cong)) hoc danh khoa hoc ma hoi luan van van.
• Adding a wildcard symbol may retrieve word variants: te sach dong tac, nghien ((cuu mon) or (cuu cong)) hoc danh khoa hoc ma hoi luan van van*.