Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
cham cuu » cap cuu, chat cua
thanh va » thanh van, hanh va, thanh ha
sang ma » tang ma, nang ma, sang tao
va cham » va chat, va tham
cuu ban » cuu van, cua ban, cuu san
ca tren » cau tren, cu tren, la tren
va ca » va cac, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((nang x) or (sang ma)) hoi. lieu va cham cuu ban thanh va ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang x) OR (sang ma)) hoi. lieu va cham cuu ban thanh va ca tren*.