Perhaps you should try some spelling variations:
dam thuc » am thuc, dan thuc, nam thuc
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
cua tre » cua te, cuu tre, cua triet
cam tu » cam thu, nam tu, dam tu

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

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