Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trang » thanh trung, canh tranh, hanh trinh
thong cong » tong cong, thong thong, phong chong
lieu tinh » trieu tinh, diep tinh, bien tinh
trang cua » tranh cua, tang cua, trung cua
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 ((chieu xanh) or (lieu tinh)) - hanh trang cua ((thong cong) OR (trong cong)) bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (lieu tinh)) - hanh trang cua ((thong cong) OR (trong cong)) bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) or (lieu tinh)) - hanh trang cua ((thong cong) OR (trong cong)) bai toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (lieu tinh)) - hanh trang cua ((thong cong) OR (trong cong)) bai toan cau*.