Perhaps you should try some spelling variations:
thien van » thi van
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
van cac » van hac, van cau, van bac
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 (nang ma)) hoi. thien van cac du ((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 (nang ma)) hoi. thien van cac du ((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 (nang ma)) hoi. thien van cac du ((va hanh) or (va danh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: so nganh ky ((nang xa) OR (nang ma)) hoi. thien van cac du ((va hanh) or (va danh)) vi cua tre*.