Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
danh vai » danh sai, danh va, doanh van
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
van cac » van hac, van cau, van bac
sang ma » tang ma, nang ma, sang tao
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 (sang ma)) hoi. hieu van cac thuc va danh 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 (sang ma)) hoi. hieu van cac thuc va danh vai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang xa) or (sang ma)) hoi. hieu van cac thuc va danh vai ((cua tre) or (cuu tre))*.