Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu xanh » chieu sach, chieu sang, chieu tinh
chinh cua » chinh ca, chinh sua, hinh cua
chinh tai » chinh tri
chu xanh » chu manh, chua xang, chuc danh
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
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 ((chu xanh) OR (chieu xanh)) - hanh ((chinh cua) or (chinh tai)) nhung cong bai toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu xanh) OR (chieu xanh)) - hanh ((chinh cua) OR (chinh tai)) nhung cong bai toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu xanh) OR (chieu xanh)) - hanh ((chinh cua) or (chinh tai)) nhung cong bai toan tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chu xanh) OR (chieu xanh)) - hanh ((chinh cua) or (chinh tai)) nhung cong bai toan tap*.