Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
cong thanh » dong thanh, cong trinh, cong tan
hanh hang » thanh hang, hang hang, hanh han
tong cong » trong cong, cong cong, dung cong
toan cao » toan ban
toan tap » toan ban
hang ca » hang va, nang cao, hang tai
ca tong » ca trong, cap tong, cua tong

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

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