Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
thu xac » thau xay
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
dao duc » giao duc, tao duoc
xac ky » cac ky, sac ky, bac ky
va dan » ca dan, va dao, va dau
dan da » dan dat, dan ca, dan va
da cua » dai cua, day cua, dan 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 dan da 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 dan da cua su.
• Adding a wildcard symbol may retrieve word variants: thu xac ky nang xa hoi. ((hieu va) or (hieu van)) dao duc va dan da cua su*.