Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hien tach » thien hach, chiet tach, vien bach
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat
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: hoc hien tach - hanh trinh va dung cong ((dan than) OR (dan chan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien tach - hanh trinh va dung cong ((dan than) OR (dan chan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hien tach - hanh trinh va dung cong ((dan than) OR (dan chan)) cau*.