Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh di » thanh doi, thanh de, thanh do
sach hoi » sach doi, sach moi, cach thoi
quoc ban » quoc bao, quoc lan, quoc quan
cac quoc » cac nuoc, cac cuoc, cao quoc
nang ma » tang ma, sang ma, nang cao
sach lo » sach dao, sach doi, sach moi
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach lo) OR (sach hoi)) ((nang xa) or (nang ma)) hoi. lieu va cac quoc ban thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach lo) OR (sach hoi)) ((nang xa) OR (nang ma)) hoi. lieu va cac quoc ban thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach lo) OR (sach hoi)) ((nang xa) or (nang ma)) hoi. lieu va cac quoc ban thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach lo) OR (sach hoi)) ((nang xa) or (nang ma)) hoi. lieu va cac quoc ban thanh di cua tre*.