Perhaps you should try some spelling variations:
danh dan » danh dau, canh dan, dang dan
dam thuc » am thuc, dan thuc, nam thuc
cua tre » cua te, cuu tre, cua triet
dan cua » dan ca, ban cua, dai cua
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
sai ky » sac ky
cam tu » cam thu, nam tu, dam tu
te sai » te tai, te bai, te lai

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: te sai ky ((nang xa) OR (nang ma)) hoi. hieu va ((dam thuc) OR (cam tu)) va danh dan cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky ((nang xa) OR (nang ma)) hoi. hieu va ((dam thuc) or (cam tu)) va danh dan cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sai ky ((nang xa) OR (nang ma)) hoi. hieu va ((dam thuc) or (cam tu)) va danh dan cua tre*.