Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
vu sach » vu bach, su sach, vu khach
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
nang ro » nang co, nang ho, nang ra
ro hoi » co hoi, o hoi, mo hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (toc sach)) ky nang ro hoi. ((hieu ve) or (hieu van)) cam duc ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (toc sach)) ky nang ro hoi. ((hieu ve) OR (hieu van)) cam duc ban thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (toc sach)) ky nang ro hoi. ((hieu ve) or (hieu van)) cam duc ban thanh dai cua tre*.