Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh thang » nhanh thang, thanh thang, hanh trang
hieu lang » chieu sang, nhieu tang, hieu van
dung cong » dung trong
thang he » tang he, thang nghe, thang nho
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
he dung » he dong, te dung, nghe dung

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 (hieu quang)) - hanh thang he dung cong dan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu lang) OR (hieu quang)) - hanh thang he dung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) OR (hieu quang)) - hanh thang he dung cong dan toan cao*.