Perhaps you should try some spelling variations:
su sach » so sach, vu sach
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
ve coc » ve cuoc, ve cac
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua
ve co » vo co, va co, de co

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) or (ve co)) tuc va tinh va 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) OR (ve co)) tuc va tinh va 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) or (ve co)) tuc va tinh va cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) OR (ky dang)) xa hoi. hieu ((ve coc) or (ve co)) tuc va tinh va cua tre*.