Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
thanh dai » thanh hai, thanh tai, thanh oai
cham cuu » cap cuu, chat cua
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ve cham » va cham, ve chat, vu cham
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
cuu ve » cuu va

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 ty ((nang xa) or (nang ma)) hoi. hieu ve cham cuu ve ((thanh dai) OR (thanh dat)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty ((nang xa) OR (nang ma)) hoi. hieu ve cham cuu ve ((thanh dai) OR (thanh dat)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty ((nang xa) or (nang ma)) hoi. hieu ve cham cuu ve ((thanh dai) OR (thanh dat)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach ty ((nang xa) or (nang ma)) hoi. hieu ve cham cuu ve ((thanh dai) OR (thanh dat)) cua tre*.