Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
tieu xanh » tieu danh, chieu xanh, dieu hanh
hanh manh » hanh mang, hoang manh, thanh minh
lanh manh » lanh tranh, lan anh, van manh
hang cong » dang cong, hang nong, bang cong
tac toan » tap toan, tam toan, hach toan
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: theo tieu xanh - ((hanh manh) or (lanh manh)) va ((nhung cong) OR (hang cong)) tac toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - ((hanh manh) OR (lanh manh)) va ((nhung cong) OR (hang cong)) tac toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - ((hanh manh) or (lanh manh)) va ((nhung cong) OR (hang cong)) tac toan tap".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - ((hanh manh) or (lanh manh)) va ((nhung cong) OR (hang cong)) tac toan tap*.