Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
vi cua » vai cua, di cua
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) or (dang xay)) hoi. ((hieu ve) or (hieu van)) cam tuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (dang xay)) hoi. ((hieu ve) OR (hieu van)) cam tuc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (dang xay)) hoi. ((hieu ve) or (hieu van)) cam tuc van hanh vi cua tre*.