Perhaps you should try some spelling variations:
nam thuc » nam thuoc, nam thu, nam tu
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, cua triet
tu cao » tu cac, vu cao, su cao
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cao) OR (cu cao)) ky nang ma hoi. hieu va ((nam thuc) OR (am thuc)) va danh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cao) OR (cu cao)) ky nang ma hoi. hieu va ((nam thuc) or (am thuc)) va danh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((tu cao) OR (cu cao)) ky nang ma hoi. hieu va ((nam thuc) or (am thuc)) va danh vi cua tre*.