Perhaps you should try some spelling variations:
dieu cua » dieu tra
thu sac » thu sach, thu san, thu xac
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
dao duc » giao duc, tao duoc
va dang » van dang, va nang, va lang
cua duc » cua tuc, cua nuoc, cua quoc
sac ky » cac ky, sai ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang xa hoi. ((hieu va) OR (hieu qua)) dao duc va dang dieu cua duc~.
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang xa hoi. ((hieu va) or (hieu qua)) dao duc va dang dieu cua duc*.