Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hang tai » dung tai
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
du ban » dua ban, duc ban, du bao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang x hoi. hieu ve cac du ban ((hang tai) or (hang va)) ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ve cac du ban ((hang tai) OR (hang va)) ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu ve cac du ban ((hang tai) or (hang va)) ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ve cac du ban ((hang tai) or (hang va)) ((cua tre) OR (cua triet))*.