Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chua nang » chuc nang, chua xang, kha nang
hanh han » hanh nhan, hanh phan, hanh san
va duong » van duong, va huong, va dong
va tuong » va thuong, va thong, xa truong
dan toan » van toan, dan than, manh toan
toan cau » 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: theo ((chua nang) or (chieu sach)) - hanh han ((va duong) or (va tuong)) huong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chua nang) OR (chieu sach)) - hanh han ((va duong) OR (va tuong)) huong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: theo ((chua nang) or (chieu sach)) - hanh han ((va duong) or (va tuong)) huong dan toan cau*.