Perhaps you should try some spelling variations:
hieu thien » hieu hien, chieu chien, dieu khien
thien cac » hien cac, thien cau, thieu cac
cua triet » cua viet, su triet, va triet
nang xa » nang x, lang xa, nang ma
cac cao » cac co, ca cao, bac cao
cao van » cac van, dao van, cao dang
minh va » tinh va, sinh va, sinh vat
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 thien cac cao van minh 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 thien cac cao van minh va ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu thien cac cao van minh va ((cua tre) or (cua triet))*.