Perhaps you should try some spelling variations:
su sach » so sach, vu sach
tinh da » tinh va, tinh gia, tinh lao
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
ky lang » ky dang, ky tang, tay lang
ve coc » ve cuoc, ve cac
luc va » duc va, tuc va, loc va
da cua » dai cua, day cua, dan cua
ve co » vo co, va co, de co

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (ky nang)) xa hoi. hieu ((ve coc) OR (ve co)) luc va tinh da cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky lang) OR (ky nang)) xa hoi. hieu ((ve coc) or (ve co)) luc va tinh da cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) OR (ky nang)) xa hoi. hieu ((ve coc) or (ve co)) luc va tinh da cua tre*.