Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
nam duoc » nam thuoc, da duoc, dat duoc
cuu tre » cua tre, cau tren, cau treo
san cuu » san cua, san huu, song cuu
hieu va » lieu va, hieu qua
dang ma » dang mau, dang mam, dang mat
hieu ve » hieu van
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
su sac » su sach, su cac, su xac

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 dang ma hoi. ((hieu ve) or (hieu va)) ((nam duoc) or (pham duc)) van thanh san cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky dang ma hoi. ((hieu ve) OR (hieu va)) ((nam duoc) OR (pham duc)) van thanh san cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky dang ma hoi. ((hieu ve) or (hieu va)) ((nam duoc) or (pham duc)) van thanh san cuu tre*.