Perhaps you should try some spelling variations:
cap hoi » cap phoi, cau hoi, cap thai
cap voi » cap phoi, cham voi, giap voi
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
so cac » sao cac, so cap, o cac
luc va » duc va, tuc va, loc 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: so cac ky nang ((cap hoi) OR (cap voi)). ((hieu ve) or (lieu va)) cam luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so cac ky nang ((cap hoi) OR (cap voi)). ((hieu ve) OR (lieu va)) cam luc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so cac ky nang ((cap hoi) OR (cap voi)). ((hieu ve) or (lieu va)) cam luc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: so cac ky nang ((cap hoi) OR (cap voi)). ((hieu ve) or (lieu va)) cam luc va hanh vi cua tre*.