Perhaps you should try some spelling variations:
mang thong » mang trong, hang thuong, dang thuong
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
quan lua » quan luan, quan cua, quang cua
lua mang » cua mang, lua sang, qua mang
thong ca » thong cua, thong cac, thong cap
ca luan » cu luan, ca lua, ca quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu lang) or (chieu sach)) - lien quan lua mang thong ca luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu lang) OR (chieu sach)) - lien quan lua mang thong ca luan van.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu lang) or (chieu sach)) - lien quan lua mang thong ca luan van*.