Perhaps you should try some spelling variations:
thanh loi » thanh hoa, thanh lap
thanh hai » thanh phan, thanh hoa, thanh san
nang cau » nang cao, hang cau, nang dau
thanh de » hanh de, thanh ve, thanh do
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
dan va » doan va, dan ca, ban va

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 y nang cau hoi. hieu ve cac dan va ((thanh de) or (((thanh loi) OR (thanh hai)))) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang cau hoi. hieu ve cac dan va ((thanh de) OR (((thanh loi) OR (thanh hai)))) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang cau hoi. hieu ve cac dan va ((thanh de) or (((thanh loi) OR (thanh hai)))) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang cau hoi. hieu ve cac dan va ((thanh de) or (((thanh loi) OR (thanh hai)))) cuu tre*.