Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va danh » va dinh, va hanh, dia danh
buu tre » cuu tre
cam tu » cam thu, nam tu, dam tu
va dan » ca dan, va dao, va dau

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