Perhaps you should try some spelling variations:
thanh sang » thanh san, thanh hang, thanh hoang
van thanh » ban thanh, van tuan
sang cua » mang cua, song cua, hang cua
cham sat » cham mat, cham soc, khao sat
cua tre » cua te, cuu tre, cua triet
dang xa » dang xay, lang xa, dang ha
hieu vu » hieu ve, hieu su, dieu vu
sat van » sat va, hat van, hoat van
hieu va » lieu va, hieu qua
sac ky » cac ky

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

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