Perhaps you should try some spelling variations:
cuon sach » duong sach, cuoc cach, nuoc sach
cua triet » cua viet, su triet, va triet
cau thuc » cau truc, cuu thuc, can thuc
hieu van » hieu va, thien van, lieu va
co sach » bo sach, hoc sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((cuon sach) or (co sach)) y ((nang xa) or (nang ma)) hoi. hieu van cau thuc va danh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((cuon sach) OR (co sach)) y ((nang xa) OR (nang ma)) hoi. hieu van cau thuc va danh di cua triet.
• Adding a wildcard symbol may retrieve word variants: ((cuon sach) or (co sach)) y ((nang xa) or (nang ma)) hoi. hieu van cau thuc va danh di cua triet*.