Perhaps you should try some spelling variations:
hieu thien » chieu chien, dieu khien, bieu hien
cua triet » cua viet, su triet, va triet
hieu hien » bieu hien, dieu hien, chieu chien
van dinh » van minh, van dich, va dinh
cac dao » cac dan, ca dao, cac dai
dao van » do van, dang van
nang xa » nang x, lang xa, nang ma
dinh va » dinh van, dinh ve, tinh va
cua tre » cua te, cuu tre, dua tren
sac ky » cac ky, sai ky
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 thien) OR (hieu hien)) cac dao 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 thien) OR (hieu hien)) cac dao 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 thien) OR (hieu hien)) cac dao van dinh va ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. ((hieu thien) OR (hieu hien)) cac dao van dinh va ((cua tre) or (cua triet))*.