Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam tu
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
nang co » nang cao, nang doc, nang noi
hieu ve » hieu va
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
co hoi » co hoc, co loi
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sac ky nang co hoi. ((hieu ve) or (hieu van)) ((nam thuc) OR (nam thu)) va thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky nang co hoi. ((hieu ve) OR (hieu van)) ((nam thuc) OR (nam thu)) va thanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sac ky nang co hoi. ((hieu ve) or (hieu van)) ((nam thuc) OR (nam thu)) va thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky nang co hoi. ((hieu ve) or (hieu van)) ((nam thuc) OR (nam thu)) va thanh va cua tre*.