Perhaps you should try some spelling variations:
hien hieu » thien hieu, nhien lieu, dien chieu
hieu hieu » hieu hien, thien hieu, huu hieu
cua triet » cua viet, su triet, va triet
van dinh » van minh, van dich, va dinh
nang xa » nang x, lang xa, nang ma
cac bao » cach bao, cac bai, cac ban
bao van » dao van, cao van, hao van
dinh va » dinh van, dinh ve, tinh va
cua tre » cua te, cuu tre, dua tren
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

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