Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
quoc ban » quoc bao, quoc lan, quoc quan
cuc ban » cua ban, cac ban, cuu ban
te sach » toc sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien cac
di cuu » di cau, di cua, dinh cuu

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 (so sach)) ky nang xa hoi. hieu ve cac ((quoc ban) or (cuc ban)) thanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sach)) ky nang xa hoi. hieu ve cac ((quoc ban) OR (cuc ban)) thanh di cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sach)) ky nang xa hoi. hieu ve cac ((quoc ban) or (cuc ban)) thanh di cuu tre*.