Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hanh tang » hanh trang, anh tang, hanh mang
dung cong » dung trong
chi tach » chiu trach, chiet tach, chi thanh
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi tach - ((hanh tang) or (canh tranh)) va ((nhung cong) OR (dung cong)) san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi tach - ((hanh tang) OR (canh tranh)) va ((nhung cong) OR (dung cong)) san toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chi tach - ((hanh tang) or (canh tranh)) va ((nhung cong) OR (dung cong)) san toan cao".
• Adding a wildcard symbol may retrieve word variants: doi chi tach - ((hanh tang) or (canh tranh)) va ((nhung cong) OR (dung cong)) san toan cao*.