Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
chieu sang » chieu sach, chieu xanh, hieu lang
canh manh » lanh manh, canh tranh, cach mang
hang cong » dang cong, hang nong, bang cong
cua sinh » hoa sinh, va sinh
manh cua » doanh cua, ban cua
san toan » van toan, dan toan, manh 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: ho ((chieu sang) or (cua sinh)) - canh manh cua ((nhung cong) OR (hang cong)) san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (cua sinh)) - canh manh cua ((nhung cong) OR (hang cong)) san toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (cua sinh)) - canh manh cua ((nhung cong) OR (hang cong)) san toan cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (cua sinh)) - canh manh cua ((nhung cong) OR (hang cong)) san toan cau*.