Perhaps you should try some spelling variations:
so nganh » so ngan, hoc nganh, moi nganh
nganh ky » nganh y, nganh xay, hanh ky
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
hieu ve » hieu va
cac duc » cac du, cao duc, cac dac
va hanh » va thanh, va danh, ban hanh
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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

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