Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
quoc ban » quoc bao, quoc lan, quoc quan
xuc ban » duc ban, cuc ban, xuat ban
va tham » van tham, va cham, va thanh
nang ro » nang co, nang ho, nang ra
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ro hoi » co hoi, o hoi, mo hoi
banh d » anh d, binh d
d cua » de cua, do cua, da cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ty nang ro hoi. lieu va tham ((xuc ban) or (quoc ban)) banh d cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang ro hoi. lieu va tham ((xuc ban) OR (quoc ban)) banh d cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty nang ro hoi. lieu va tham ((xuc ban) or (quoc ban)) banh d cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty nang ro hoi. lieu va tham ((xuc ban) or (quoc ban)) banh d cua tre*.