Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, hieu lang
cong thanh » dong thanh, cong trinh, cong tan
hay khong » bay khong, hang khong, hoac khong
hua khong » hoa khong, cua khong, hoac khong
ho chieu » theo chieu, hoc thieu, doi chieu
chan cau » can cau, chinh cau, nhanh cau
phan cau » phan dau, phan cac, phan tu

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 - thanh trung ((hay khong) or (hua khong)) cong thanh ((chan cau) OR (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - thanh trung ((hay khong) OR (hua khong)) cong thanh ((chan cau) OR (phan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - thanh trung ((hay khong) or (hua khong)) cong thanh ((chan cau) OR (phan cau))".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - thanh trung ((hay khong) or (hua khong)) cong thanh ((chan cau) OR (phan cau))*.