Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
dinh dai » dinh dat, sinh dai, dinh dao
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang
cac bo » bac bo, cac co
bo va » bao va, do va, so va

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