Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
tu sach » thu sach, su sach, te sach
cuc ban » cua ban, cac ban, cuu ban
xuc ban » duc ban, quoc ban, xuat ban
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
so sach » so sanh, bo sach, co sach
di cua » dai cua, doi cua, de cua
ve cam » ve cham, ve cac, va cam
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) or (so sach)) ky nang x hoi. hieu ve cam ((xuc ban) OR (cuc ban)) thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sach)) ky nang x hoi. hieu ve cam ((xuc ban) OR (cuc ban)) thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (so sach)) ky nang x hoi. hieu ve cam ((xuc ban) OR (cuc ban)) thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sach)) ky nang x hoi. hieu ve cam ((xuc ban) OR (cuc ban)) thanh di cua tre*.