Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
thanh vi » thanh va, thanh ve, nhanh vi
nang xa » lang xa, nang ma, mang xa
qua cac » cua cac
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cua tre, cau tren, cau treo
so sac » so sach, so dac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky ((nang xa) OR (nang x)) hoi. hieu qua cac thuc va ((thanh vi) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky ((nang xa) OR (nang x)) hoi. hieu qua cac thuc va ((thanh vi) OR (hanh vi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky ((nang xa) OR (nang x)) hoi. hieu qua cac thuc va ((thanh vi) or (hanh vi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: so sac ky ((nang xa) OR (nang x)) hoi. hieu qua cac thuc va ((thanh vi) or (hanh vi)) cuu tre*.