Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
ky danh » ky anh
ky dang » ky nang
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
danh ve » dinh ve, hanh ve, anh ve
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
ve cua » le cua, de cua, te cua

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) or (co sach)) ((ky danh) OR (ky dang)) xa hoi. hieu va cam xuc va danh ve cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ((ky danh) OR (ky dang)) xa hoi. hieu va cam xuc va danh ve cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (co sach)) ((ky danh) OR (ky dang)) xa hoi. hieu va cam xuc va danh ve cua viet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) ((ky danh) OR (ky dang)) xa hoi. hieu va cam xuc va danh ve cua viet*.