Perhaps you should try some spelling variations:
chat cuu » chat huu, chat cua, cham cuu
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan 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 san ky ((nang xa) or (lang xa)) hoi. hieu va chat cuu van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((nang xa) OR (lang xa)) hoi. hieu va chat cuu van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu san ky ((nang xa) or (lang xa)) hoi. hieu va chat cuu van hanh vi cua tre*.