Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam tu
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, dam thuc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
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 sac ky nang x hoi. hieu ve ((cam tuc) or (((nam thuc) OR (nam thu)))) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang x hoi. hieu ve ((cam tuc) OR (((nam thuc) OR (nam thu)))) va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang x hoi. hieu ve ((cam tuc) or (((nam thuc) OR (nam thu)))) va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang x hoi. hieu ve ((cam tuc) or (((nam thuc) OR (nam thu)))) va hanh vi cua tre*.