Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
chiet tach » chieu sach
hanh nhanh » hanh nhan, nhanh thanh, thanh thanh
quang dung » quang trung, ung dung, cuong dung
dung cong » dung trong
van thanh » van tuan
ban thanh » ban hanh, ban hang

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