Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
doc hoi » duoc hoi, hoc hoi, doi hoi
doc hai » hoc hai, do hai, ngoc hai
duc hai » cuc hai, duc dai, duc hau
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang ((doc hoi) or (((doc hai) OR (duc hai)))). hieu ve cam luc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((doc hoi) OR (((doc hai) OR (duc hai)))). hieu ve cam luc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang ((doc hoi) or (((doc hai) OR (duc hai)))). hieu ve cam luc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((doc hoi) or (((doc hai) OR (duc hai)))). hieu ve cam luc va hanh vai cua tre*.