Perhaps you should try some spelling variations:
hinh trong » chinh trong, dinh trong, sinh trong
hanh trong » hanh trang, anh trong, chinh trong
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
cong san » cong tac
san toan » van toan, dan toan, 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: ho ((chinh sach) or (hieu lang)) - ((hanh trong) OR (hinh trong)) xay dung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chinh sach) OR (hieu lang)) - ((hanh trong) OR (hinh trong)) xay dung cong san toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chinh sach) or (hieu lang)) - ((hanh trong) OR (hinh trong)) xay dung cong san toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chinh sach) or (hieu lang)) - ((hanh trong) OR (hinh trong)) xay dung cong san toan cao*.