Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tranh » canh tranh, hanh trinh, hanh trang
trong dan » trong dang, trong san, trong tan
cua dang » cua ban
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap

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 tinh) or (chieu sang)) - hanh tranh ((cua dang) OR (cua cong)) trong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu tinh) OR (chieu sang)) - hanh tranh ((cua dang) OR (cua cong)) trong dan than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((chieu tinh) or (chieu sang)) - hanh tranh ((cua dang) OR (cua cong)) trong dan than tap".
• Adding a wildcard symbol may retrieve word variants: doc ((chieu tinh) or (chieu sang)) - hanh tranh ((cua dang) OR (cua cong)) trong dan than tap*.