Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh lai » thanh hai, thanh lap, thanh loi
tu cach » tu cac
cam duc » cao duc, pham duc, nam duoc
lai cua » dai cua, hai cua, lai chau
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
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: ((tu cach) or (su sach)) ky nang o hoi. hieu ve ((cam duc) OR (cam xuc)) van thanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky nang o hoi. hieu ve ((cam duc) OR (cam xuc)) van thanh lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su sach)) ky nang o hoi. hieu ve ((cam duc) OR (cam xuc)) van thanh lai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (su sach)) ky nang o hoi. hieu ve ((cam duc) OR (cam xuc)) van thanh lai cua te*.