Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
va trien » va truyen, va thiet, va tuyen
sach tai » sach bai, sach tham, sach dao
sach thi » sach thu, sach thieu, sach tham
cua tre » cua te, cuu tre, cua triet
xuc ban » duc ban, cuc ban, quoc ban
hieu va » lieu va, hieu qua
hong xa » hoang xa, phong xa, hmong xa
va cam » va cham, va cac, va cao

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 thi) OR (sach tai)) hong xa hoi. hieu va cam xuc ban thanh van ((cua tre) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thi) OR (sach tai)) hong xa hoi. hieu va cam xuc ban thanh van ((cua tre) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach thi) OR (sach tai)) hong xa hoi. hieu va cam xuc ban thanh van ((cua tre) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: su ((sach thi) OR (sach tai)) hong xa hoi. hieu va cam xuc ban thanh van ((cua tre) or (va trien))*.