Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu van » hieu va, thien van, lieu va
hanh tri » thanh tri, hanh tai, hanh triet
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
cao duc » dao duc, cao suc, tao duoc
su dai » sau dai, si dai, su tai
dai ky » dan ky, dai ly, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su dai ky nang xa hoi. hieu van ((cao duc) OR (giao duc)) van ((hanh tri) or (hanh trinh)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su dai ky nang xa hoi. hieu van ((cao duc) OR (giao duc)) van ((hanh tri) OR (hanh trinh)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su dai ky nang xa hoi. hieu van ((cao duc) OR (giao duc)) van ((hanh tri) or (hanh trinh)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su dai ky nang xa hoi. hieu van ((cao duc) OR (giao duc)) van ((hanh tri) or (hanh trinh)) cua tre*.