Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu tinh » trieu tinh, lieu tinh, chau tinh
tinh hoang » minh hoang, dinh hoang, binh hoang
dong trong » duong trong, dung trong, cong trong
hoang van » hang va
trong dan » trong dang, trong san, trong tan
dan luan » doanh luan, dung luan, tang luan

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 tinh)) - tinh hoang van dong trong dan luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sach) OR (chieu tinh)) - tinh hoang van dong trong dan luan van.
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sach) or (chieu tinh)) - tinh hoang van dong trong dan luan van*.