Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dam thuc » am thuc, dan thuc, nam thuc
kinh moi » dinh moi, kinh mon, sinh moi
sach ky » sach y, sach ty, sach kem
va kinh » va tinh, qua kinh
moi cua » hoi cua, doi cua, moi quan
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
cam tu » cam thu, nam tu, dam tu
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) OR (sac ky)) nang x hoi. hieu van ((dam thuc) or (cam tu)) va kinh moi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang x hoi. hieu van ((dam thuc) OR (cam tu)) va kinh moi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sac ky)) nang x hoi. hieu van ((dam thuc) or (cam tu)) va kinh moi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sac ky)) nang x hoi. hieu van ((dam thuc) or (cam tu)) va kinh moi cua tre*.