Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thanh tung » thanh cong
cong thanh » cong trinh, cong tan, truong thanh
dong thanh » truong thanh
hieu lang » chieu sang, hieu quang, nhieu tang
tung cua » trung cua, tuong cua, dung cua
than cap » khan cap, thanh lap, thanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) or (thieu quang)) - thanh tung cua cong ((cong thanh) OR (dong thanh)) than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (thieu quang)) - thanh tung cua cong ((cong thanh) OR (dong thanh)) than cap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) or (thieu quang)) - thanh tung cua cong ((cong thanh) OR (dong thanh)) than cap*".