Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
te sach » toc sach
hieu va » hieu qua
dan tai » van tai, dan thi, han tai
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
duc ca » duc cac, duc va, duc ha
ca dan » cac dan, ca dao
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: ((te sach) or (thu hoach)) ky nang x hoi. ((hieu va) or (lieu va)) cham duc ca dan tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu hoach)) ky nang x hoi. ((hieu va) OR (lieu va)) cham duc ca dan tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu hoach)) ky nang x hoi. ((hieu va) or (lieu va)) cham duc ca dan tai cua tre*.