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

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) OR (cuu 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) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty tang) or (ty hang)) xa hoi. hieu ve coc luc va tinh vai ((cua tre) OR (cuu 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) OR (cuu tre))*.