Perhaps you should try some spelling variations:
van hoang » van hoan, quan hoang, tran hoang
hoang dai » hoang hai, hoang mai, hoang da
toc sach » hoc sach, doc sach, thuoc sach
dieu cua » dieu tra
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
cac tu » cac thu, cach tu, cac du
tu van » tu va
x hoi » o hoi, x ho, 5 hoi

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) or (toc sach)) ky nang ((x hoi) or (xa hoi)). dieu cua cac tu van hoang dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ky nang ((x hoi) OR (xa hoi)). dieu cua cac tu van hoang dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ky nang ((x hoi) or (xa hoi)). dieu cua cac tu van hoang dai cua tre*.