Perhaps you should try some spelling variations:
nam thuc » nam thuoc, nam thu, nam tu
hieu ve » hieu va, hieu van
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac
te san » te ban, ke san, tu san
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: ((te sac) OR (te san)) ky nang x ho. hieu ve ((nam thuc) or (am thuc)) va danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te san)) ky nang x ho. hieu ve ((nam thuc) OR (am thuc)) va danh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te san)) ky nang x ho. hieu ve ((nam thuc) or (am thuc)) va danh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te san)) ky nang x ho. hieu ve ((nam thuc) or (am thuc)) va danh vi cua tre*.