Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
bac ky » cac ky, sac ky, bac sy
ban ky » van ky, dan ky
ve cam » ve cham, ve cac, va cam
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

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