Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
chang xu » chang xue, chao xu, thong xu
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
sach tu » cach tu, sach ty, sach uu
cua tre » cua te, cuu tre, cua triet
hang x » nang x, hoang xa, hang nxb

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 tu) or (sach thu)) ((hang x) OR (chang xu)) hoi. hieu van cau duc ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (sach thu)) ((hang x) OR (chang xu)) hoi. hieu van cau duc ban thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tu) or (sach thu)) ((hang x) OR (chang xu)) hoi. hieu van cau duc ban thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) or (sach thu)) ((hang x) OR (chang xu)) hoi. hieu van cau duc ban thanh dai cua tre*.