Perhaps you should try some spelling variations:
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hieu lang » chieu sang, hieu quang, nhieu tang
doanh cua » doanh luan
manh cua » ban cua
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - canh ((doanh cua) or (manh cua)) ((nhung cong) OR (thong cong)) van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh ((doanh cua) OR (manh cua)) ((nhung cong) OR (thong cong)) van toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - canh ((doanh cua) or (manh cua)) ((nhung cong) OR (thong cong)) van toan cao".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh ((doanh cua) or (manh cua)) ((nhung cong) OR (thong cong)) van toan cao*.