Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, can thuc
kinh moi » dinh moi, kinh mon, sinh moi
te sach » toc sach
sach ky » sac ky, sach y, sach ty
cam thu » nam thu, cac thu, ca thu
va kinh » va tinh, qua kinh
moi cua » hoi cua, doi cua, moi quan
cua tre » cua te, cuu tre, cua triet
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 sach ky nang x hoi. hieu van ((cam thuc) or (cam thu)) va kinh moi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. hieu van ((cam thuc) OR (cam thu)) va kinh moi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. hieu van ((cam thuc) or (cam thu)) va kinh moi cua tre*.