Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
so sach » so sanh, co sach, hoc sach
bo sach » co sach, hoc sach
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
cac lo » cac lop, cac co, cac bo
cua te » cua tu
lo va » lo van, lao va, ly va
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) OR (bo sach)) ky nang x hoi. hieu ve cac lo va ((hanh vai) or (hanh vi)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) ky nang x hoi. hieu ve cac lo va ((hanh vai) OR (hanh vi)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (bo sach)) ky nang x hoi. hieu ve cac lo va ((hanh vai) or (hanh vi)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (bo sach)) ky nang x hoi. hieu ve cac lo va ((hanh vai) or (hanh vi)) cua te*.