Perhaps you should try some spelling variations:
chiet tach » chieu sach
chieu sang » chieu sach, chieu xanh, hieu lang
hanh bang » anh bang, hanh mang, lanh bang
vat dung » van dung, viet dung, mat duong
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan ban » can ban, chat ban, chan nan
va dung » van dung, va duong, va ung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chiet tach) or (chieu sang)) - hanh bang ((va dung) OR (vat dung)) cong dan chan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chiet tach) OR (chieu sang)) - hanh bang ((va dung) OR (vat dung)) cong dan chan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chiet tach) or (chieu sang)) - hanh bang ((va dung) OR (vat dung)) cong dan chan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chiet tach) or (chieu sang)) - hanh bang ((va dung) OR (vat dung)) cong dan chan ban*.