Perhaps you should try some spelling variations:
ban hanh » ban hang
cham cuu » cap cuu, chat cua
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cuu ban » cuu van, cua ban, cuu san
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sac ky » cac ky
vi cua » vai cua, di cua

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) OR (sai ky)) ((nang xa) or (lang xa)) hoi. hieu van cham cuu ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sai ky)) ((nang xa) OR (lang xa)) hoi. hieu van cham cuu ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sac ky) OR (sai ky)) ((nang xa) or (lang xa)) hoi. hieu van cham cuu ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) OR (sai ky)) ((nang xa) or (lang xa)) hoi. hieu van cham cuu ban hanh vi cua tre*.