Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, nhieu tang
tuan trong » thuan trong, quan trong, toan trong
tran trong » gian trong, quan trong, tran hong
hieu lang » hieu quang, nhieu tang, hieu van
cong tan » cong tac, cong san, cong thanh
tan khan » tan khang, tan nhan, toan khoan
khan ap » khan cap, han ap, khan dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sang) OR (hieu lang)) - thanh trung ((tuan trong) or (tran trong)) cong tan khan ap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - thanh trung ((tuan trong) OR (tran trong)) cong tan khan ap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) OR (hieu lang)) - thanh trung ((tuan trong) or (tran trong)) cong tan khan ap".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) OR (hieu lang)) - thanh trung ((tuan trong) or (tran trong)) cong tan khan ap*.