Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
thieu quang » hieu quang, thien quan, trien quang
trong quang » truong quang, thong quang, trong quan
quang trung » truong trung
chieu sach » chinh sach, chiet tach, chieu sang
trung song » trung uong, trung son, trung dong
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu quang) or (chieu sach)) - thanh trong quang trung song ((van toan) OR (van tuan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu quang) OR (chieu sach)) - thanh trong quang trung song ((van toan) OR (van tuan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu quang) or (chieu sach)) - thanh trong quang trung song ((van toan) OR (van tuan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu quang) or (chieu sach)) - thanh trong quang trung song ((van toan) OR (van tuan)) cau*.