Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vu sach » vu bach, su sach, vu khach
ly vang » ly hang, ly van, ly quang
hieu ve » hieu va, hieu van
cac thu » cach thuc, cac thoi
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
ve cac » va cac, vien cac
thu va » thuc va, thue va, tu va

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 nang) OR (ly vang)) xa hoi. hieu ve cac thu va hanh vi ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ky nang) or (ly vang)) xa hoi. hieu ve cac thu va hanh vi ((cua tre) OR (cua triet))~".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky nang) or (ly vang)) xa hoi. hieu ve cac thu va hanh vi ((cua tre) OR (cua triet))*.