Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
thuc van » thuc vat, thuc dan, thuc va
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cua triet, dua tren
so sach » so sanh, bo sach, co sach
van cac » van hac, van cau, van bac
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo

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

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