Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
va dinh » van dinh, va tinh, vu dinh
va kinh » va tinh, qua kinh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
cac bo » bac bo, cac co

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 cac bo ((va dinh) OR (va kinh)) dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu hien cac bo ((va dinh) OR (va kinh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu hien cac bo ((va dinh) OR (va kinh)) dai cua tre*.