Perhaps you should try some spelling variations:
vu thanh » su thanh, vu khanh, cuu thanh
thanh ky » hanh ky, than ky, thanh tay
hanh dai » hanh tai, hanh dao, vanh dai
xay hoi » tay hoi, cay phoi, gay thoi
van cac » van hac, van bac, dan cac
van cau » van dau, van hau, van chat
va hanh » van hanh, va thanh, va danh
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: vu thanh ky nang ((xay hoi) or (xa hoi)). thien ((van cac) OR (van cau)) nuoc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu thanh ky nang ((xay hoi) OR (xa hoi)). thien ((van cac) OR (van cau)) nuoc va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu thanh ky nang ((xay hoi) or (xa hoi)). thien ((van cac) OR (van cau)) nuoc va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: vu thanh ky nang ((xay hoi) or (xa hoi)). thien ((van cac) OR (van cau)) nuoc va hanh dai cua tre*.