Perhaps you should try some spelling variations:
thanh sang » thanh san, thanh hang, thanh hoang
ban thanh » ban hanh, ban hang
cham sat » cham mat, khao sat, giam sat
sang cua » mang cua, song cua, hang cua
ky dang » ky nang
ky danh » ky anh
hieu va » lieu va, hieu qua
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: tu cac ((ky dang) OR (ky danh)) xa hoi. hieu va ((cham sat) or (cham soc)) ban thanh sang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ((ky dang) OR (ky danh)) xa hoi. hieu va ((cham sat) OR (cham soc)) ban thanh sang cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ((ky dang) OR (ky danh)) xa hoi. hieu va ((cham sat) or (cham soc)) ban thanh sang cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ((ky dang) OR (ky danh)) xa hoi. hieu va ((cham sat) or (cham soc)) ban thanh sang cua tre*.