Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang ji » nang si, nang noi, nang tai
da nang » cam nang, kha nang, cao nang
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tac, cac nuoc
lang xa » lang ha, dang xay, lang van
sac ky » cac ky
cac tu » cac thu, cach tu, cac du
ji cua » di cua

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: tu ((sac ky) OR (sai ky)) lang xa hoi. hieu va ((cac tuc) OR (cac tu)) da nang ji cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) or (sai ky)) lang xa hoi. hieu va ((cac tuc) OR (cac tu)) da nang ji cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sai ky)) lang xa hoi. hieu va ((cac tuc) OR (cac tu)) da nang ji cua triet*.