Perhaps you should try some spelling variations:
nuoc quan » nuoc luan, quoc quan, nguoi quan
phuc ban » thuc ban, thuoc ban, phuc hang
phuc van » thuc van, phuc va, chuc van
hieu va » lieu va, hieu qua
quan ky » quan ly, quan y, xuan ky
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc quan ky nang xa hoi. ((hieu ve) or (hieu va)) cac ((phuc ban) OR (phuc van)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc quan ky nang xa hoi. ((hieu ve) OR (hieu va)) cac ((phuc ban) OR (phuc van)) hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc quan ky nang xa hoi. ((hieu ve) or (hieu va)) cac ((phuc ban) OR (phuc van)) hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: nuoc quan ky nang xa hoi. ((hieu ve) or (hieu va)) cac ((phuc ban) OR (phuc van)) hanh di cua tre*.