Perhaps you should try some spelling variations:
thanh luan » tranh luan, thanh xuan, thanh tuan
van thanh » ban thanh, van tuan
luan phat » luan phan, luan chat, tuan phat
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cau duc » cao duc, chu duc, cau truc
cau luc » cau truc, cau phuc
nang o » nang co, nang ho, nang ro
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: tu sach ky nang o hoi. hieu van ((cau duc) or (cau luc)) van thanh luan phat trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hoi. hieu van ((cau duc) OR (cau luc)) van thanh luan phat trien.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu van ((cau duc) or (cau luc)) van thanh luan phat trien*.