Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cac thuc » cach thuc, cac thu, can thuc
su sach » so sach, vu sach
ly hang » ly quang
ly vang » ly van, ly quang
van cac » van hac, van cau, van bac
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 ((ly hang) or (ly vang)) xa hoi. hieu van cac thuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly hang) OR (ly vang)) xa hoi. hieu van cac thuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ly hang) or (ly vang)) xa hoi. hieu van cac thuc va hanh vi cua tre*.