Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, danh lien
cam thuc » am thuc, nam thuc, cam thu
thuc van » thuc vat, thuc dan, thuc va
van danh » van doanh, van anh, van hanh
dien cuc » dien tu, dieu cua, vien cac
cuc tieu » muc tieu, cac tieu, cach tieu
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
sach 2 » sach y
2 nang » v nang

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 2 nang xa hoi. ((hieu ve) or (hieu va)) cam thuc van danh dien cuc tieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach 2 nang xa hoi. ((hieu ve) OR (hieu va)) cam thuc van danh dien cuc tieu.
• Adding a wildcard symbol may retrieve word variants: so sach 2 nang xa hoi. ((hieu ve) or (hieu va)) cam thuc van danh dien cuc tieu*.