Perhaps you should try some spelling variations:
thanh sang » thanh san, thanh hang, thanh hoang
van thanh » ban thanh, van tuan
dang xay » dang van, van xay
qua khao » qua khai, qua kho, luan khao
sang cua » mang cua, song cua, hang cua
dang xa » lang xa, dang ha, dang va
sat van » sat va, hat van, hoat van
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((dang xa) OR (dang xay)) hoi. hieu qua khao sat van thanh sang cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((dang xa) or (dang xay)) hoi. hieu qua khao sat van thanh sang cua tre*.