Perhaps you should try some spelling variations:
thanh hoi » thanh hoai, thanh hoa, thanh hai
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
y nang » ly nang, v nang, may nang
ve cao » ve bao, ve cac, ve co
va cao » va cac, va co, va dao

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