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