Perhaps you should try some spelling variations:
sach tham » sach nha
ban thanh » ban hanh, ban hang
thanh tai » thanh hai, thanh toan, doanh tai
sach tac » sach bac, sach tai, sach truc
quang ma » xquang ma, quang va, quang manh
hieu van » hieu va, thien van, lieu va
van nang » van quang, van ban, van dong
luc ban » duc ban, cuc ban, luc bat
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

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 tac) OR (sach tham)) quang ma hoa. hieu van nang luc ban thanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tac) OR (sach tham)) quang ma hoa. hieu van nang luc ban thanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach tac) OR (sach tham)) quang ma hoa. hieu van nang luc ban thanh tai cua tre*.