Perhaps you should try some spelling variations:
nguoi sach » nguoi san, nuoc sach
hieu van » hieu va, thien van, lieu va
cau phuc » cau truc, chau phu, huu phuc
phuc van » thuc van, phuc va, chuc van
van hanh » van thanh, ban hanh, van anh
hanh doi » thanh doi, hanh noi, hang doi
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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 ma) or (nang x)) hoi. hieu van cau phuc van hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nguoi sach ky ((nang ma) OR (nang x)) hoi. hieu van cau phuc van hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: nguoi sach ky ((nang ma) or (nang x)) hoi. hieu van cau phuc van hanh doi cua tre*.