Perhaps you should try some spelling variations:
dung hoai » dung hai, dang hoai, dung hoa
dung hoi » duong hoi, dung thoi, dung hoc
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
so sai » so dai, so hai, do sai
sai ky » sac ky
ve am » va am

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sai ky nang x ho. hieu ve am thuc va ((dung hoi) OR (dung hoai)) ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sai ky nang x ho. hieu ve am thuc va ((dung hoi) OR (dung hoai)) ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sai ky nang x ho. hieu ve am thuc va ((dung hoi) OR (dung hoai)) ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sai ky nang x ho. hieu ve am thuc va ((dung hoi) OR (dung hoai)) ((cua tre) or (cuu tre))*.