Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
van thanh » ban thanh, van tuan
chat sac » hat sac, chat va, chat ban
ve chat » va chat, van chat
ky tang » ky nang, kho tang, ky trong
cua tre » cuu tre, cua triet, dua tren
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
sac van » cac van, san van, sat van
su sac » su sach, su cac, su xac
cua te » cua tu

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

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