Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
lang trong » dung trong, cong trong, dong trong
trong tran » trong trang, trong tranh, trong tan
quang lua » quang cua, quang tuan, quang xuan
lua lang » cua lang, dua lang, lua sang
tran 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 sang) or (chieu sach)) - tinh quang lua lang trong tran van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (chieu sach)) - tinh quang lua lang trong tran van ban.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) or (chieu sach)) - tinh quang lua lang trong tran van ban*.