Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
thanh tinh » thanh binh, nhanh tinh, than kinh
thong cong » trong cong, tong cong, thong thong
cua thong » cua thuong, cua khong, cua tong
cong manh » cong danh, duong manh, cong thanh
tinh cua » trinh cua, sinh cua, tinh chat
toan cao » toan ban
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((chieu sang) OR (chieu sach)) - thanh tinh cua thong cong manh ((toan cao) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu sang) OR (chieu sach)) - thanh tinh cua thong cong manh ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((chieu sang) OR (chieu sach)) - thanh tinh cua thong cong manh ((toan cao) or (toan tap))".
• Adding a wildcard symbol may retrieve word variants: doc ((chieu sang) OR (chieu sach)) - thanh tinh cua thong cong manh ((toan cao) or (toan tap))*.