Perhaps you should try some spelling variations:
cua ngan » cua ban, vu ngan, cua dan
cau tren » cu tren, dau tren, ca tren
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
cua nam » cua tam, cua nhan
xua va » xuat va, vua va, sua va
va dao » ca dao
dao vi » dao voi, dao ve, dao va
vi cau » va cau, ve cau, di cau
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu ((cua nam) OR (cua ngan)) xua va dao vi cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang x hoi. hieu ((cua nam) OR (cua ngan)) xua va dao vi cau tren".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang x hoi. hieu ((cua nam) OR (cua ngan)) xua va dao vi cau tren*.