Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, nhieu tang
tang quang » dang quang, tang quan, hang quang
quang dung » quang trung, ung dung, cuong dung
hieu lang » hieu quang, nhieu tang, hieu van
dung cong » dung trong
anh tang » anh bang, anh dang, anh nang
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) OR (chieu sang)) - anh tang quang dung cong dan than ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) OR (chieu sang)) - anh tang quang dung cong dan than ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) OR (chieu sang)) - anh tang quang dung cong dan than ban*.