Perhaps you should try some spelling variations:
hanh dinh » thanh dinh, hinh dinh, hanh tinh
dinh cua » dinh cuu, sinh cua, dinh cu
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
bai ky » sai ky, bac ky, dai ky
ban ky » van ky, dan ky
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((bai ky) OR (ban ky)) nang x hoi. ((hieu ve) or (hieu van)) cac vuc van hanh dinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((bai ky) OR (ban ky)) nang x hoi. ((hieu ve) OR (hieu van)) cac vuc van hanh dinh cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((bai ky) OR (ban ky)) nang x hoi. ((hieu ve) or (hieu van)) cac vuc van hanh dinh cua tre*".