Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
ty hang » ly hang, thi hang, thu hang
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
ve cac » va cac, vien cac
vi luu » vi lua
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 ((ty hang) OR (ty xang)) x hoi. hieu ve cac duc va hanh vi luu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty hang) OR (ty xang)) x hoi. hieu ve cac duc va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty hang) OR (ty xang)) x hoi. hieu ve cac duc va hanh vi luu tre*.