Perhaps you should try some spelling variations:
chap thuong » chan thuong, phan thuong, pham thuong
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trinh » hanh chinh
chap nhung » cua nhung, tham nhung, cho nhung
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
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: toc thieu xanh - ((canh tranh) or (hanh trinh)) ((chap nhung) OR (chap thuong)) cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc thieu xanh - ((canh tranh) OR (hanh trinh)) ((chap nhung) OR (chap thuong)) cong tap toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc thieu xanh - ((canh tranh) or (hanh trinh)) ((chap nhung) OR (chap thuong)) cong tap toan cao".
• Adding a wildcard symbol may retrieve word variants: toc thieu xanh - ((canh tranh) or (hanh trinh)) ((chap nhung) OR (chap thuong)) cong tap toan cao*.