Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh mang » nhanh mang, hanh trang, nhanh lang
dung cong » dung trong
mang vat » dang vat, bang vat, cang vat
vat dung » van dung, va dung, viet dung
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (chiet tach)) - hanh mang vat dung cong ((dan than) or (dan chan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - hanh mang vat dung cong ((dan than) OR (dan chan)) tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chiet tach)) - hanh mang vat dung cong ((dan than) or (dan chan)) tap*.