Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
te san » te ban, ke san, tu san
san ky » sang ky, van ky, dan ky
dam tu » nam tu, cam tu, tam tu
thuc » thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky nang x ho. hieu ve ((am thuc) or (dam tu)) ((va hanh) OR (va danh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky nang x ho. hieu ve ((am thuc) OR (dam tu)) ((va hanh) OR (va danh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te san ky nang x ho. hieu ve ((am thuc) or (dam tu)) ((va hanh) OR (va danh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te san ky nang x ho. hieu ve ((am thuc) or (dam tu)) ((va hanh) OR (va danh)) vai cua tre*.