Perhaps you should try some spelling variations:
danh dien » dinh dien, danh kien, nganh dien
danh lien » danh kien, doanh tien, doanh vien
khoa hoc » hoa hoc
toc sach » hoc sach, doc sach, thuoc sach
vu khoa » cu khoa, ve khoa, tu khoa
hieu vu » hieu va, hieu ve, hieu su
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) v nang xa hoi. hieu vu khoa hoc va ((danh lien) or (danh dien)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v nang xa hoi. hieu vu khoa hoc va ((danh lien) OR (danh dien)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) v nang xa hoi. hieu vu khoa hoc va ((danh lien) or (danh dien)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) v nang xa hoi. hieu vu khoa hoc va ((danh lien) or (danh dien)) cua tre*.