Perhaps you should try some spelling variations:
lang trong » dung trong, cong trong, dong trong
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
quang lua » quang cua, quang tuan, quang xuan
trong dan » trong dang, trong san, trong tan
lua lang » cua lang, dua lang, lua sang
dan than » dan chan, ban than, van than
than man » than ma, thanh san, tran manh

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)) - tinh quang lua lang trong dan than man~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu lang) OR (chieu sach)) - tinh quang lua lang trong dan than man".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu lang) OR (chieu sach)) - tinh quang lua lang trong dan than man*.