Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
tieu xanh » tieu danh, chieu xanh, dieu hanh
mang cua » manh cua, ban cua, cong cua
dung cua » dung luan, dung cho
cong bai » cuong bai, cong hai, cung bai
bai toan » bai tap
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 ((mang cua) OR (dung cua)) nhung cong bai toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - anh ((mang cua) OR (dung cua)) nhung cong bai toan cao".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - anh ((mang cua) OR (dung cua)) nhung cong bai toan cao*.