Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh hai, tinh bai
su sach » so sach, vu sach
ty tang » tay tang, ty xang, ky tang
ty hang » ly hang, ty xang, thi hang
hieu ve » hieu va, hieu van
va tinh » may tinh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
ve coc » ve cuoc, ve cac, ve co
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty tang) or (ty hang)) xa hoi. hieu ve coc luc va tinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty tang) OR (ty hang)) xa hoi. hieu ve coc luc va tinh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty tang) or (ty hang)) xa hoi. hieu ve coc luc va tinh vai cua tre*.