Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
vu sach » vu bach, su sach, vu khach
tinh va » tich va, trinh van, trinh vat
ky lang » ky nang, ky tang, tay lang
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
va tinh » may tinh
ve cac » va cac, vien cac

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: vu sach ((ky lang) OR (ky dang)) xa hoi. hieu ve cac truc va tinh va ((cua tre) OR (hoa viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ky lang) OR (ky dang)) xa hoi. hieu ve cac truc va tinh va ((cua tre) or (hoa viet))~".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky lang) OR (ky dang)) xa hoi. hieu ve cac truc va tinh va ((cua tre) or (hoa viet))*.