Perhaps you should try some spelling variations:
nguoi sach » nguoi san, nuoc sach
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
huu thuc » cuu thuc, huu phuc, huu thu
sach ky » sac ky, sach y, sach ty
hanh di » hanh vi, hanh de, hang di
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu van
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: nguoi sach ky ((nang xa) or (nang x)) hoi. ((hieu ve) or (hieu va)) huu thuc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nguoi sach ky ((nang xa) OR (nang x)) hoi. ((hieu ve) OR (hieu va)) huu thuc van hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: nguoi sach ky ((nang xa) or (nang x)) hoi. ((hieu ve) or (hieu va)) huu thuc van hanh di cua tre*.