Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
van tham » van thanh, van tuan, van chat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
tan anh » tuan anh, tran anh, toan anh
cua tre » cua te, cuu tre, cua triet
o hoi » co hoi, o hoc, o hai
d cua » de cua, do cua, da cua

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 ky nang ((xa hoi) or (o hoi)). hieu ((va thanh) or (van tham)) duc tan anh d cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((xa hoi) OR (o hoi)). hieu ((va thanh) OR (van tham)) duc tan anh d cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((xa hoi) or (o hoi)). hieu ((va thanh) or (van tham)) duc tan anh d cua tre*.