Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thanh va » thanh van, hanh va, thanh ha
su sach » so sach, vu sach
ky dang » ky danh
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cao, va cai
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca 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 ((ky dang) or (ky nang)) xa hoi. hieu ((va cam) OR (va cac)) luc va thanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky dang) OR (ky nang)) xa hoi. hieu ((va cam) OR (va cac)) luc va thanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky dang) or (ky nang)) xa hoi. hieu ((va cam) OR (va cac)) luc va thanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky dang) or (ky nang)) xa hoi. hieu ((va cam) OR (va cac)) luc va thanh va cua tre*.