Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
thien danh » thien anh, thien dang, thien thanh
chieu xanh » chieu sach, chieu sang, chieu tinh
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan ban » van ban
hoan va » khoan va, hoang va, toan va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien danh) or (chieu xanh)) - doanh ((hoan va) OR (doan va)) thuong cong tac toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (chieu xanh)) - doanh ((hoan va) OR (doan va)) thuong cong tac toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien danh) or (chieu xanh)) - doanh ((hoan va) OR (doan va)) thuong cong tac toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) or (chieu xanh)) - doanh ((hoan va) OR (doan va)) thuong cong tac toan ban*.