Perhaps you should try some spelling variations:
so nganh » so ngan, hoc nganh, moi nganh
nganh ky » nganh y, nganh xay, hanh ky
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
vi cua » vai cua, di cua
ve cac » va cac, vien cac

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