Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong dong, truong cong
chieu xanh » chieu sach, chieu sang, chieu tinh
thuong con » thuong dong, truong cong, thong cong
doi chieu » doc hieu, doi chi, ho chieu
canh dan » canh van, thanh dan, cac dan
sanh dan » sach danh, sinh danh, thanh dan
toan cao » toan ban, toan tap

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

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