Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chieu xanh, hieu cach
hanh bang » anh bang, hanh mang, lanh bang
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan ban » can ban, chat ban, chan nan
bang va » hang va, ban va, trang va
va dung » van dung, va duong, vat dung

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