Perhaps you should try some spelling variations:
su sach » so sach, vu sach
danh di » danh du, xanh di, danh dien
danh vi » hanh vi, dinh vi, danh va
cac thu » cach thuc, cac thoi
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ly vang » ly hang, ly van, ly quang
ly nang » ky nang, ly hang, ly quang
thu va » thuc va, thue va, tu va
ve cac » va cac, vien cac

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 ((ly nang) or (ly vang)) xa hoi. hieu ve cac thu va ((danh vi) OR (danh di)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ly vang)) xa hoi. hieu ve cac thu va ((danh vi) OR (danh di)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) or (ly vang)) xa hoi. hieu ve cac thu va ((danh vi) OR (danh di)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) or (ly vang)) xa hoi. hieu ve cac thu va ((danh vi) OR (danh di)) cua tre*.