Perhaps you should try some spelling variations:
thanh hoa » thanh pho
van thanh » ban thanh, van tuan
so sach » so sanh, bo sach, co sach
duc van » duc va, duc tan, duc manh
cua tre » cua te, cua triet, dua tren
sach tu » sach thu, cach tu, sach ty
van cau » van dau, van hau, van chat
van cam » van nam, van lam, van dam
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
cuu tre » cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tu nang xa hoi. hieu ((van cam) OR (van cau)) duc van thanh hoa ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tu nang xa hoi. hieu ((van cam) OR (van cau)) duc van thanh hoa ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu nang xa hoi. hieu ((van cam) OR (van cau)) duc van thanh hoa ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sach tu nang xa hoi. hieu ((van cam) OR (van cau)) duc van thanh hoa ((cua tre) or (cuu tre))*.