Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
hieu van » thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
dien cuc » dien tu, dieu cua, vien cac
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
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 van))) or (hieu va)) cam thuc va danh dien 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 van))) OR (hieu va)) cam thuc va danh dien 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 van))) or (hieu va)) cam thuc va danh dien cuc te".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. ((((hieu ve) OR (hieu van))) or (hieu va)) cam thuc va danh dien cuc te*.