Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
thanh lai » thanh hai, thanh lap, thanh loi
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
cao hoi » co hoi, cao hoc, tao hoi
cau duc » cao duc, cau luc, cau truc
chu duc » thu duc, chua duoc, cuu duoc
y nang » ky nang, ly nang, v nang

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 y nang ((cao hoi) or (cau hoi)). hieu van ((cau duc) OR (chu duc)) van thanh lai chau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((cao hoi) OR (cau hoi)). hieu van ((cau duc) OR (chu duc)) van thanh lai chau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((cao hoi) or (cau hoi)). hieu van ((cau duc) OR (chu duc)) van thanh lai chau triet".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((cao hoi) or (cau hoi)). hieu van ((cau duc) OR (chu duc)) van thanh lai chau triet*.