Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat cua » nhat cua, chat va, chat huu
dan hanh » dang hanh, dan khanh, dan thanh
nang xa » nang x, lang xa, nang ma
cua dan » cua dang, cua ban, ca dan
cua tre » cua te, cuu tre, dua tren
tu van » tu va

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

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