Perhaps you should try some spelling variations:
duy sang » duy van, duy can, duy anh
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
dan du » dan dau, danh du, dan su
vu ban » tu ban, va ban
va dan » ca dan, va dao, va dau
ve cac » va cac, vien cac
du va » dau va, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ban ((duy sang) or (ky dang)) xa hoi. hieu ve cac du va dan du ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ban ((duy sang) OR (ky dang)) xa hoi. hieu ve cac du va dan du ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: vu ban ((duy sang) or (ky dang)) xa hoi. hieu ve cac du va dan du ((cua tre) or (cuu tre))*.