Perhaps you should try some spelling variations:
dam thuc » am thuc, dan thuc, nam thuc
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hanh » va thanh, va danh, ban hanh
dai cuu » dai cua, dai huu
cuu tre » cua tre, cau tren, cau treo
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 tu nang xa hoi. hieu ve ((dam thuc) or (cam tu)) ((va hanh) or (van hanh)) dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang xa hoi. hieu ve ((dam thuc) OR (cam tu)) ((va hanh) OR (van hanh)) dai cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu nang xa hoi. hieu ve ((dam thuc) or (cam tu)) ((va hanh) or (van hanh)) dai cuu tre*.