Perhaps you should try some spelling variations:
lang thang » dang thanh, hung thang, lang trong
chieu xanh » chieu sach, chieu sang, chieu tinh
cang thang » cong thanh, dang thanh
chu xanh » chu manh, chua xang, chuc danh
va trong » va truong, va thong, va tuong
cong bai » cuong bai, cong hai, cung bai
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 ((chu xanh) OR (chieu xanh)) - ((lang thang) or (cang thang)) va trong cong bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu xanh) OR (chieu xanh)) - ((lang thang) OR (cang thang)) va trong cong bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu xanh) OR (chieu xanh)) - ((lang thang) or (cang thang)) va trong cong bai toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chu xanh) OR (chieu xanh)) - ((lang thang) or (cang thang)) va trong cong bai toan cau*.