Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
thai cua » than cua, tai cuc, tri cua
ky dang » ky danh
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
cua tre » cua te, cuu tre, cua triet
su sai » su tai, su hai, su dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ((ky dang) OR (ky nang)) xa hoi. hieu ve pham duc ((van hanh) or (ban hanh)) thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ((ky dang) OR (ky nang)) xa hoi. hieu ve pham duc ((van hanh) OR (ban hanh)) thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ((ky dang) OR (ky nang)) xa hoi. hieu ve pham duc ((van hanh) or (ban hanh)) thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ((ky dang) OR (ky nang)) xa hoi. hieu ve pham duc ((van hanh) or (ban hanh)) thai cua tre*.