Perhaps you should try some spelling variations:
dam thuc » am thuc, dan thuc, nam thuc
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
dan cua » dan ca, ban cua, day cua
te sai » te tai, te bai, te lai
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa
cam tu » cam thu, nam tu, dam tu

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