Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
may cua » day cua, may bua, may sua
cua tre » cua te, cuu tre, cua triet
te sai » te tai, te bai, te lai
sai ky » sac ky
cam tu » cam thu, nam tu, dam tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky nang x hoi. hieu ve ((nam thuc) or (cam tu)) ((va hanh) OR (va danh)) may cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky nang x hoi. hieu ve ((nam thuc) OR (cam tu)) ((va hanh) OR (va danh)) may cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky nang x hoi. hieu ve ((nam thuc) or (cam tu)) ((va hanh) OR (va danh)) may cua tre*".