Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach
thuat tach » thuat sach, thuat mach, thuat tac
dung cong » dung trong
tranh va » tranh van, trang va, trinh va
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: thep ((thiet tach) OR (thuat tach)) - canh tranh va dung cong dan toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thep ((thiet tach) OR (thuat tach)) - canh tranh va dung cong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: thep ((thiet tach) OR (thuat tach)) - canh tranh va dung cong dan toan ban*.