Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
tieu xanh » tieu danh, chieu xanh, dieu hanh
hang cong » dang cong, hang nong, bang cong
anh dang » anh dung, anh bang, anh danh
anh dong » anh huong, anh son
bai toan » bai tap
toan cau » 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: theo tieu xanh - ((anh dang) OR (anh dong)) cua ((nhung cong) or (hang cong)) bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - ((anh dang) OR (anh dong)) cua ((nhung cong) OR (hang cong)) bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - ((anh dang) OR (anh dong)) cua ((nhung cong) or (hang cong)) bai toan cau".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - ((anh dang) OR (anh dong)) cua ((nhung cong) or (hang cong)) bai toan cau*.