Perhaps you should try some spelling variations:
hieu hieu » hien hieu, hieu hien, thien hieu
hieu cach » hieu cac, chieu sach, hieu ca
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
cach bao » cach nao, sach bao, cach giao
cua tre » cua te, cuu tre, dua tren
va dinh » van dinh, va kinh, va tinh
dinh va » dinh van, dinh ve, tinh va
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
bao va » bao ve, tao va, ban va
tu sac » tu sach, tu cac, tu san

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 cach bao va dinh va ((cua tre) or (((cua triet) or (su triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu hieu cach bao va dinh va ((cua tre) OR (((cua triet) OR (su triet)))).
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu hieu cach bao va dinh va ((cua tre) or (((cua triet) or (su triet))))*.