Perhaps you should try some spelling variations:
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky
ve cam » ve cham, ve cac, va cam
xuc va » duc va, tuc va, luc va
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 (nang x)) hoi. hieu ve cam xuc va 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 (nang x)) hoi. hieu ve cam xuc va 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 (nang x)) hoi. hieu ve cam xuc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) OR (sai ky)) ((nang xa) or (nang x)) hoi. hieu ve cam xuc va hanh vi cua tre*.