Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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

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