Perhaps you should try some spelling variations:
cua thuong » cua truong, ca thuong, cua huong
cua phuong » cuu phuong, cuc phuong, luan phuong
hanh tang » hanh trang, anh tang, hanh mang
lai toan » bai toan, lap toan, lai thanh
toan cao » toan ban, toan tap
li tinh » vi tinh, bi tinh, li kinh
con lai » cong lai, con lam, chong lai
so li » so ly, so di

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so li tinh - ((hanh tang) or (canh tranh)) ((cua thuong) OR (cua phuong)) con lai toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so li tinh - ((hanh tang) OR (canh tranh)) ((cua thuong) OR (cua phuong)) con lai toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so li tinh - ((hanh tang) or (canh tranh)) ((cua thuong) OR (cua phuong)) con lai toan cao".
• Adding a wildcard symbol may retrieve word variants: so li tinh - ((hanh tang) or (canh tranh)) ((cua thuong) OR (cua phuong)) con lai toan cao*.