Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
tinh vi » trinh vi, tinh voi, tinh va
ty hang » ly hang, ty xang, thi hang
ty dang » ty xang, ky dang, ty dong
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
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 ((ty dang) or (ty hang)) xa hoi. lieu va cam ((luc va) OR (tuc va)) tinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty dang) OR (ty hang)) xa hoi. lieu va cam ((luc va) OR (tuc va)) tinh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty dang) or (ty hang)) xa hoi. lieu va cam ((luc va) OR (tuc va)) tinh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty dang) or (ty hang)) xa hoi. lieu va cam ((luc va) OR (tuc va)) tinh vi cua tre*.