Perhaps you should try some spelling variations:
"cau cong trinh ngan" » "cau cong chinh ngan", "cau cong trinh han", "cau cong trinh quan", "cac cong trinh ngan", "cuu cong trinh ngan", "cao cong trinh ngan"
"cau cong tinh quang" » "cau cong vinh quang", "cau cong thanh quang", "cau trong tinh quang", "cac cong tinh quang", "cuu cong tinh quang", "cao cong tinh quang"
"cau long tinh quang" » "cau trong tinh quang", "cau luong tin quang", "cau dong tin quang", "cuu long tinh quang", "cau dong tinh quang", "ca long tinh quang"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("cau cong trinh ngan") or ((("cau cong tinh quang") OR ("cau long tinh quang"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cau cong trinh ngan") OR ((("cau cong tinh quang") OR ("cau long tinh quang"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cau cong trinh ngan\") or (((\"cau cong tinh quang\") OR (\"cau long tinh quang\"))))*".
• Removing quotes may allow a broader search: (( cau cong trinh ngan ) or ((( cau cong tinh quang ) OR ( cau long tinh quang ))))*.