Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
hanh tang » hanh trang, anh tang, hanh mang
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man
ho hieu » ho chieu, hoi hieu, nho hieu
va nang » van nang, da nang, kha nang

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 quan - hanh tang ((va nang) OR (cam nang)) cong dan than ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quan - hanh tang ((va nang) OR (cam nang)) cong dan than ban".
• Adding a wildcard symbol may retrieve word variants: ho hieu quan - hanh tang ((va nang) OR (cam nang)) cong dan than ban*.