Perhaps you should try some spelling variations:
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
cam duc » cam xuc, pham duc, nam duoc
lai cua » dai cua, hai cua, lai chau
cao duc » dao duc, cao suc, giao duc
cu lang » cua lang, xu lang, chi lang
tu lang » tu lanh, xu lang, tu quang
cua tre » cua te, cuu tre, cua triet

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 ((tu lang) or (cu lang)) xa hoi. hieu van ((cam duc) or (cao duc)) van thanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu lang) OR (cu lang)) xa hoi. hieu van ((cam duc) OR (cao duc)) van thanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu lang) or (cu lang)) xa hoi. hieu van ((cam duc) or (cao duc)) van thanh lai cua tre*.