Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
thu xac » thau xay
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
dao duc » giao duc, tao duoc
va hanh » va thanh, va danh, ban hanh
xac ky » cac ky, sac ky, bac ky
di cua » dai cua, doi cua, de cua
cua su » qua su

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

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