Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
cau quoc » cac quoc, cao quoc, han quoc
quoc ban » quoc bao, quoc lan, quoc quan
su sach » so sach, vu sach
ky tang » ky nang, ky dang, kho tang
cua tre » cuu tre, cua triet, dua tren
va cau » van cau, va cac, va dau
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ky tang) or (cao dang)) xa hoi. lieu va cau quoc ban thanh hai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky tang) OR (cao dang)) xa hoi. lieu va cau quoc ban thanh hai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sach ((ky tang) or (cao dang)) xa hoi. lieu va cau quoc ban thanh hai ((cua tre) or (cua te))*.