Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, 5 hoi
co va » co ma, do va, so va
o va » do va, so va, bo va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang ((x hoi) or (x ho)). hieu ve cham ((o va) OR (co va)) thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((x hoi) OR (x ho)). hieu ve cham ((o va) OR (co va)) thanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang ((x hoi) or (x ho)). hieu ve cham ((o va) OR (co va)) thanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((x hoi) or (x ho)). hieu ve cham ((o va) OR (co va)) thanh van cua tre*.