Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
loc va » luc va
vi cua » vai cua, di cua
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((nang xa) or (dang xay)) hoi. hieu van cac ((loc va) or (hoc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (dang xay)) hoi. hieu van cac ((loc va) OR (hoc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (dang xay)) hoi. hieu van cac ((loc va) or (hoc va)) hanh vi cua tre*.