Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
ky sang » ky dang, ky tang, duy sang
hieu ve » hieu va, hieu van
va hanh » van hanh, va danh, ban hanh
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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