Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
nhanh thi » nhanh thai, nhanh thuc, nhan tai
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
du ban » dua ban, duc ban, du bao
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
o hai » co hai, so hai, o lai

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 o hai. hieu ve cac du ban ((hanh thai) or (nhanh thi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang o hai. hieu ve cac du ban ((hanh thai) OR (nhanh thi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang o hai. hieu ve cac du ban ((hanh thai) or (nhanh thi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang o hai. hieu ve cac du ban ((hanh thai) or (nhanh thi)) cua tre*.