Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cau » van dau, van chat, toan cau
van hau » van ha, van hai, van dau
duc van » duc va, duc tan, duc manh
san cua » sang cua, ban cua, dan cua
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: thu sach ky nang xa hoi. hieu ((van cau) or (van hau)) duc van thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ((van cau) OR (van hau)) duc van thanh san cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ((van cau) or (van hau)) duc van thanh san cua tre*.