Perhaps you should try some spelling variations:
ban hanh » ban hang
thu sach » thuat sach, thuoc sach, thu hoach
hanh tai » thanh tai, hang tai, han tai
tu sach » su sach, te sach, tu cach
cua tre » cuu tre, cua triet, dua tren
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
tuc ban » thuc ban, truc ban, tu ban
ve cac » va cac, vien cac
cua te » cua tu
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 (thu sach)) ky nang x hoi. hieu ve cac tuc ban hanh tai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang x hoi. hieu ve cac tuc ban hanh tai ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang x hoi. hieu ve cac tuc ban hanh tai ((cua tre) OR (cua te))*".