Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trang » thanh trung, canh tranh, hanh trinh
hieu lang » chieu sang, nhieu tang, hieu van
hanh mang » nhanh mang, nhanh lang, thanh hang
dung cong » dung trong
van tuyen » va tuyen, van chuyen, van nguyen
cong van » cong vang, cong san, song van
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: ho ((hieu lang) OR (hieu quang)) - ((hanh mang) or (hanh trang)) va dung cong van tuyen tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu lang) OR (hieu quang)) - ((hanh mang) OR (hanh trang)) va dung cong van tuyen tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (hieu quang)) - ((hanh mang) or (hanh trang)) va dung cong van tuyen tap".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (hieu quang)) - ((hanh mang) or (hanh trang)) va dung cong van tuyen tap*.