Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
canh trinh » canh tranh, hanh trinh, canh tinh
dung cong » dung trong
trinh ve » trinh he, trinh va, trinh vi
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap
ho lieu » so lieu, ho kieu, ho chieu
co lieu » cot lieu, co hieu, so lieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho lieu) or (co lieu)) tinh - canh trinh ve ((nhung cong) OR (dung cong)) san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho lieu) OR (co lieu)) tinh - canh trinh ve ((nhung cong) OR (dung cong)) san toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho lieu) or (co lieu)) tinh - canh trinh ve ((nhung cong) OR (dung cong)) san toan cao*".