Perhaps you should try some spelling variations:
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
cua tre » cua te, cuu tre, cua triet
ve cac » vien cac
thu va » thuc va, thue va, tu va
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 nang) OR (ly vang)) x hoi. hieu ((ve cac) or (va cac)) thu va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ly vang)) x hoi. hieu ((ve cac) OR (va cac)) thu va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) OR (ly vang)) x hoi. hieu ((ve cac) or (va cac)) thu va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) OR (ly vang)) x hoi. hieu ((ve cac) or (va cac)) thu va hanh vi cua tre*.