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