Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
tu sach » thu sach, su sach, tu cach
luc van » luoc van, luu van, duc van
cac luc » cau luc, coc luc, cac nuoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
te sach » toc sach
ve cac » va cac, vien cac
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: ((tu sach) or (te sach)) ky nang x hoi. hieu ve cac luc van ((hanh vai) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang x hoi. hieu ve cac luc van ((hanh vai) OR (hanh vi)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang x hoi. hieu ve cac luc van ((hanh vai) OR (hanh vi)) cua tre*".