Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh vai » tinh va, tinh hai, tinh bai
su sach » so sach, vu sach
ty tang » tay tang, ty hang, ky tang
hieu ve » hieu va, hieu van
va tinh » may tinh
cua tre » cua te, cuu tre, dua tren
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 xang)) xa hoi. hieu ve coc luc va tinh vai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty tang) OR (ty xang)) xa hoi. hieu ve coc luc va tinh vai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty tang) or (ty xang)) xa hoi. hieu ve coc luc va tinh vai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty tang) or (ty xang)) xa hoi. hieu ve coc luc va tinh vai ((cua tre) OR (cua triet))*.