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
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, kho tang, ky trong
ky dang » ky nang, ky danh
ve coc » ve cuoc, ve co
ve cac » va cac, vien cac
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 tang)) xa hoi. hieu ((ve coc) OR (ve cac)) thuc va tinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky dang) OR (ky tang)) xa hoi. hieu ((ve coc) OR (ve cac)) thuc va tinh va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky dang) or (ky tang)) xa hoi. hieu ((ve coc) OR (ve cac)) thuc va tinh va cua tre*".