Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
hieu hien » bieu hien, chieu chien, dieu khien
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
dinh va » dinh van, dinh ve, tinh va
va dinh » van dinh, va kinh, va tinh
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
ca lao » cua lao, ca dao, ca cao
lao va » tao va, cao va, bao va
cua te » cua tu

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 y nang xa hoi. ((hieu hien) OR (dieu hien)) ca lao va dinh va ((cuu tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. ((hieu hien) OR (dieu hien)) ca lao va dinh va ((cuu tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. ((hieu hien) OR (dieu hien)) ca lao va dinh va ((cuu tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. ((hieu hien) OR (dieu hien)) ca lao va dinh va ((cuu tre) or (cua te))*.