Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
dinh huong » dinh duong, anh huong
dong duong » tuong duong, cuong duong, dong thong
ho chieu » theo chieu, hoc thieu, doi chieu
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
tung va » trung va, tuong va, dung va

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 tung va ((dinh huong) or (dong duong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sach - thanh tung va ((dinh huong) OR (dong duong)) dan toan cao.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh tung va ((dinh huong) or (dong duong)) dan toan cao*.