Perhaps you should try some spelling variations:
thanh tiep » thanh hiep, thanh tien, thanh thieu
ban thanh » ban hanh, ban hang
tiep cua » tiep can, dieu cua, tap cua
cac tac » cac bac, cac dac, cac tai
cac toc » cac toi, cac nuoc, cac thoi
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sanh) or (do sanh)) ky nang x hoi. hieu qua ((cac tac) OR (cac toc)) ban thanh tiep cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sanh) OR (do sanh)) ky nang x hoi. hieu qua ((cac tac) OR (cac toc)) ban thanh tiep cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sanh) or (do sanh)) ky nang x hoi. hieu qua ((cac tac) OR (cac toc)) ban thanh tiep cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sanh) or (do sanh)) ky nang x hoi. hieu qua ((cac tac) OR (cac toc)) ban thanh tiep cua tre*.