Perhaps you should try some spelling variations:
danh viet » anh viet, ninh viet, nang viet
danh kien » dinh kien, linh kien, van kien
nam thuc » nam thuoc, am thuc, nam thu
thuc va » thuc vat, thuc dan, thuc day
cu tren » tu tren, dua tren
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam
ban ky » van ky, dan ky
tu ban » thu ban, te ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ban ky ((nang xa) or (nang x)) hoi. hieu ve nam thuc va ((danh kien) or (danh viet)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ban ky ((nang xa) OR (nang x)) hoi. hieu ve nam thuc va ((danh kien) OR (danh viet)) cu tren.
• Adding a wildcard symbol may retrieve word variants: tu ban ky ((nang xa) or (nang x)) hoi. hieu ve nam thuc va ((danh kien) or (danh viet)) cu tren*.