Perhaps you should try some spelling variations:
nguoi sach » nguoi san
nuoc sach » hoc sach, cuoc cach, cuon sach
van hanh » van thanh, ban hanh, van anh
luu van » cuu van, luan van, luu hanh
cau luu » cau luc
hieu va » lieu va, hieu qua
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
vi cua » vai cua, di 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) OR (nuoc sach)) ((ty nang) or (ty hang)) xa hoi. hieu va cau luu van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nguoi sach) OR (nuoc sach)) ((ty nang) OR (ty hang)) xa hoi. hieu va cau luu van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nguoi sach) OR (nuoc sach)) ((ty nang) or (ty hang)) xa hoi. hieu va cau luu van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((nguoi sach) OR (nuoc sach)) ((ty nang) or (ty hang)) xa hoi. hieu va cau luu van hanh vi cua tre*.