Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh do » thanh de, thanh pho, thanh hoa
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cau hoa » cau hoi
hoa ban » hoa dan, hoa van, hoa han
cua tre » cua te, cuu tre, cua triet
do cua » doi cua, co 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: tu sach ky nang xa hoi. ((hieu ve) or (lieu va)) cau hoa ban thanh do cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu ve) OR (lieu va)) cau hoa ban thanh do cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu ve) or (lieu va)) cau hoa ban thanh do cua tre*.