Perhaps you should try some spelling variations:
thien danh » thien anh, thien dang, thien thanh
chieu xanh » chieu sach, chieu sang, chieu tinh
thong cong » trong cong, tong cong, thong thong
doanh va » doan va, doanh cua, hanh va
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
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: hoc ((thien danh) or (chieu xanh)) - doanh ((doanh va) OR (doanh tai)) thong cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (chieu xanh)) - doanh ((doanh va) OR (doanh tai)) thong cong tac toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien danh) or (chieu xanh)) - doanh ((doanh va) OR (doanh tai)) thong cong tac toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) or (chieu xanh)) - doanh ((doanh va) OR (doanh tai)) thong cong tac toan cao*.