Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
van thanh » ban thanh, van tuan
cham duc » pham duc, cham soc, pham duy
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
ky tang » ky nang, kho tang, ky trong
dat cua » dai cua, day cua, mat cua
ky dang » ky nang, ky danh
hieu ve » hieu van
hieu va » lieu va, hieu qua
su xac » pu xac, su cac

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

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