Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
cong quang » luong quang, thong quang, duong quang
trung hoc » trung quoc
cong vang » cong lang, cong ngang, cong san
ho chieu » theo chieu, hoc thieu, doi chieu
trung ha » trung tam, trung cap
toan cao » toan ban, toan tap

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

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