Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
hieu van » hieu va, thien van, lieu va
van cach » va cach, van canh, vat cach
thuc van » thuc vat, thuc dan, thuc va
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
minh di » minh ai, minh de, minh duc
cuu tre » cua tre, cau tren, cau treo
di cuu » di cau, di cua, dinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (cac ky)) nang xa hoi. hieu van cach thuc van minh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (cac ky)) nang xa hoi. hieu van cach thuc van minh di cuu tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (cac ky)) nang xa hoi. hieu van cach thuc van minh di cuu tre*.