Perhaps you should try some spelling variations:
lieu quan » lien quan, hieu qua, lieu van
tang van » dang van, hoang van, trong van
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap
ho lieu » so lieu, co lieu, ho kieu
tang va » trang va, thang va, tang vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho lieu quan - hanh ((tang va) or (tang van)) nang ((cong dan) OR (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho lieu quan - hanh ((tang va) OR (tang van)) nang ((cong dan) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho lieu quan - hanh ((tang va) or (tang van)) nang ((cong dan) OR (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ho lieu quan - hanh ((tang va) or (tang van)) nang ((cong dan) OR (cong san)) toan cao*.