Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
thai cua » than cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
van anh » van thanh, tuan anh, van minh
su sai » su tai, su hai, su dai
sai ky » sac ky
ve cao » va cao, ve cac, ve co
ve bao » te bao, va bao

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