Perhaps you should try some spelling variations:
tinh voi » trinh voi, tinh doi, minh voi
binh voi » binh hoi, minh voi, trinh voi
su sach » so sach, vu sach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve coc » ve cuoc, ve cac, ve co
luc va » duc va, tuc va, loc 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 ((ky lang) OR (ky dang)) xa hoi. hieu ve coc luc va ((tinh voi) or (binh voi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (ky dang)) xa hoi. hieu ve coc luc va ((tinh voi) OR (binh voi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky lang) OR (ky dang)) xa hoi. hieu ve coc luc va ((tinh voi) or (binh voi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) OR (ky dang)) xa hoi. hieu ve coc luc va ((tinh voi) or (binh voi)) cua tre*.