Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cai » va cai, ve tai
ve cau » ke cau, va cau, le cau
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
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: so sach ky lang xa hoi. hieu ((((ve cai) OR (ve cau))) or (ve cac)) xuc va hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky lang xa hoi. hieu ((((ve cai) OR (ve cau))) OR (ve cac)) xuc va hanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky lang xa hoi. hieu ((((ve cai) OR (ve cau))) or (ve cac)) xuc va hanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: so sach ky lang xa hoi. hieu ((((ve cai) OR (ve cau))) or (ve cac)) xuc va hanh vi cua viet*.