Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
cham cuu » cap cuu, chat cua
so sach » so sanh, bo sach, co sach
cuu ban » cuu van, cua ban, cuu san
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
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: so sach ky ((nang xa) OR (nang ma)) hoi. hieu ve cham cuu ban ((thanh hai) or (doanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky ((nang xa) OR (nang ma)) hoi. hieu ve cham cuu ban ((thanh hai) OR (doanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky ((nang xa) OR (nang ma)) hoi. hieu ve cham cuu ban ((thanh hai) or (doanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky ((nang xa) OR (nang ma)) hoi. hieu ve cham cuu ban ((thanh hai) or (doanh tai)) cua tre*.