Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
ban trong » bai trong, ban tuong, ben trong
trong dan » trong dang, trong san, trong tan
cau sach » cao sach, hau sach, rau sach
tang cua » mang cua, tang luan, thong cua
hang cua » mang cua, hang ca, huong cua
dan toan » van toan, dan than, manh toan
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 ((cau sach) or (chieu sach)) - hanh ((tang cua) OR (hang cua)) ban trong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((cau sach) OR (chieu sach)) - hanh ((tang cua) OR (hang cua)) ban trong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((cau sach) or (chieu sach)) - hanh ((tang cua) OR (hang cua)) ban trong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: theo ((cau sach) or (chieu sach)) - hanh ((tang cua) OR (hang cua)) ban trong dan toan cao*.