Perhaps you should try some spelling variations:
phan duc » pham duc, phan tu, phan dau
thu ban » thu hang
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua chu » sua chua
cua can » cua cac, cua ban, cua dan
ban ky » van ky, dan ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu ban ky nang x ho. ((hieu ve) OR (hieu va)) phan duc va hanh vi ((cua chu) OR (cua can))~.
• Adding a wildcard symbol may retrieve word variants: thu ban ky nang x ho. ((hieu ve) or (hieu va)) phan duc va hanh vi ((cua chu) or (cua can))*.