Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, mang xa
va hanh » van hanh, va thanh, va danh
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
cam luc » cam xuc, cau luc
vi cua » vai cua, di cua
luc va » duc va, tuc va, loc va
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam 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 cai ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu va)) cam luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) OR (hieu va)) cam luc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu va)) cam luc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cai ky ((nang xa) OR (nang ma)) hoi. ((hieu ve) or (hieu va)) cam luc va hanh vi cua tre*.