Perhaps you should try some spelling variations:
ve thanh » le thanh, de thanh, den thanh
so sach » so sanh, bo sach, co sach
san cua » sang cua, ban cua, dan cua
va cham » va chat, va tham
ve cham » ve chat, vu cham, ve chim
ty hang » ly hang, ty xang, thi hang
ty mang » ty xang, tin mang, tri mang
cua tre » cua te, cuu tre, cua triet
cuu ve » cuu va

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 mang) or (ty hang)) xa hoi. hieu ((ve cham) or (va cham)) cuu ve thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty mang) OR (ty hang)) xa hoi. hieu ((ve cham) OR (va cham)) cuu ve thanh san cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ((ty mang) or (ty hang)) xa hoi. hieu ((ve cham) or (va cham)) cuu ve thanh san cua tre*.