Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
phan duc » pham duc, phan tu, phan dau
hieu ve » hieu va
va hanh » van hanh, va thanh, va danh
san ky » sang ky, van ky, ban ky
dan ky » van ky
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su
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 ((san ky) or (dan ky)) nang x hoi. ((hieu ve) OR (hieu van)) phan duc va hanh vi cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (dan ky)) nang x hoi. ((hieu ve) OR (hieu van)) phan duc va hanh vi cua cu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) or (dan ky)) nang x hoi. ((hieu ve) OR (hieu van)) phan duc va hanh vi cua cu*".