Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
chieu sang » chieu sach, chieu xanh, hieu lang
van doanh » toan doanh, van dong, van thanh
dung cong » dung trong
hieu van » hieu va, thien van, lieu va
doanh va » doan va, doanh tai, doanh cua
dan toan » van toan, dan than, manh 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: ho ((chieu sang) or (hieu van)) - van doanh va ((nhung cong) OR (dung cong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu van)) - van doanh va ((nhung cong) OR (dung cong)) dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu van)) - van doanh va ((nhung cong) OR (dung cong)) dan toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu van)) - van doanh va ((nhung cong) OR (dung cong)) dan toan cao*.