Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
chat cua » nhat cua, chat va, chat huu
ve thanh » le thanh, de thanh, den thanh
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
cua tre » cua te, cuu tre, cua triet
cua ve » cua vi, cua te, cua vu

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 y ((nang xa) or (nang ma)) hoi. hieu ve chat cua ve thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang xa) OR (nang ma)) hoi. hieu ve chat cua ve thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang xa) or (nang ma)) hoi. hieu ve chat cua ve thanh dai cua tre*.