Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu xanh » chieu sang, chieu tinh, hieu manh
sang trong » lang trong, mang trong, nang trong
tinh quan » tinh quang, trinh quan, tin quan
trong tan » trong quan, trong cac, trong ca
quan lua » quan luan, quan cua, quang cua
lua sang » luc sang, bua sang, cua sang
tan van » tran van, tang van, luan van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu sach) or (chieu xanh)) - tinh quan lua sang trong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sach) OR (chieu xanh)) - tinh quan lua sang trong tan van ban.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sach) or (chieu xanh)) - tinh quan lua sang trong tan van ban*.