Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
ve pham » vi pham, v pham, ve phat
duc ban » duc tan, duc van, dua ban
ve phan » va phan, ke phan, ve phat
so sach » so sanh, bo sach, co sach
nang o » nang co, nang ho, nang ro
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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) or (so sach)) ky nang o hoi. hieu ((ve pham) or (ve phan)) duc ban thanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (so sach)) ky nang o hoi. hieu ((ve pham) OR (ve phan)) duc ban thanh dai cua te.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (so sach)) ky nang o hoi. hieu ((ve pham) or (ve phan)) duc ban thanh dai cua te*.