Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
thu hang » thi hang, thuc hanh, thu huong
sach thu » sach thue, sach thieu, sach tham
quoc ban » quoc bao, quoc lan, quoc quan
cua tre » cua te, cuu tre, cua triet
su sach » so sach, vu sach
hang xa » hoang xa, hang va, hang ca
su tien » su kien, su hien, tu tieng

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 thu hang xa hoi. hieu ((van lam) or (van nam)) quoc ban thanh van ((cua tre) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu hang xa hoi. hieu ((van lam) OR (van nam)) quoc ban thanh van ((cua tre) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: su sach thu hang xa hoi. hieu ((van lam) or (van nam)) quoc ban thanh van ((cua tre) or (su tien))*.