Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu sang » chieu sach, chieu xanh, nhieu tang
cong thanh » dong thanh, cong trinh, cong tan
thanh gian » thanh giang, thach giang, thanh san
hieu lang » hieu quang, nhieu tang, hieu van
hanh than » hanh han, hanh nhan, hanh phan
gian dan » gian lang
than va » thanh va, nhan va, toan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu lang) or (chieu sang)) - hanh than va nhung cong thanh gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu lang) OR (chieu sang)) - hanh than va nhung cong thanh gian dan.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu lang) or (chieu sang)) - hanh than va nhung cong thanh gian dan*.