Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
hien hanh » dieu hanh
dung doi » huong doi, dung tai, dung co
danh doi » danh di, thanh doi, danh hoa
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
duoc va » duc va, duoc ma, duong va
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. bieu hien hanh ((nuoc va) or (duoc va)) ((danh doi) OR (dung doi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. bieu hien hanh ((nuoc va) OR (duoc va)) ((danh doi) OR (dung doi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. bieu hien hanh ((nuoc va) or (duoc va)) ((danh doi) OR (dung doi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. bieu hien hanh ((nuoc va) or (duoc va)) ((danh doi) OR (dung doi)) cua tre*.