Perhaps you should try some spelling variations:
danh kien » dinh kien, danh viet, linh kien
danh dien » dinh dien, danh lien, nganh dien
cam thuc » am thuc, nam thuc, cam thu
thuc va » thuc vat, thuc dan, thuc day
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
cuc te » cua te, cuc thue, cuc tieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang xa hoi. ((hieu ve) or (hieu va)) cam thuc va ((danh dien) OR (danh kien)) cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. ((hieu ve) OR (hieu va)) cam thuc va ((danh dien) OR (danh kien)) cuc te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. ((hieu ve) or (hieu va)) cam thuc va ((danh dien) OR (danh kien)) cuc te".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. ((hieu ve) or (hieu va)) cam thuc va ((danh dien) OR (danh kien)) cuc te*.