Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cam » van lam, van cau, van dam
duc ban » duc tan, duc van, dua ban
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren

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