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
cuu tre » cua tre, cau tren, cau treo
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
tuc va » thuc va, truc va, tuc xa
va cuu » va cau, va chu, va huu

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