Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
chua xang » chua nang, chuc nang, chu bang
hanh tang » hanh trang, anh tang, hanh mang
dung cong » dung trong
chu xanh » chu manh, chieu xanh, chuc danh
tang cua » mang cua, hang cua, tang luan
tap toan » tap doan, tap quan, bai toan
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: cho ((chu xanh) or (chua xang)) - hanh tang cua ((nhung cong) OR (dung cong)) tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cho ((chu xanh) OR (chua xang)) - hanh tang cua ((nhung cong) OR (dung cong)) tap toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cho ((chu xanh) or (chua xang)) - hanh tang cua ((nhung cong) OR (dung cong)) tap toan cau".
• Adding a wildcard symbol may retrieve word variants: cho ((chu xanh) or (chua xang)) - hanh tang cua ((nhung cong) OR (dung cong)) tap toan cau*.