Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
thai cuu » thai cua, tai cuc, thi cuc
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van bac » van ban, van hac, dan bac
van bao » van ban, van dao
cuu tre » cua tre, cau tren, cau treo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang xa hoi. thien ((van bac) OR (van bao)) xuc ((van hanh) or (ban hanh)) thai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xa hoi. thien ((van bac) OR (van bao)) xuc ((van hanh) OR (ban hanh)) thai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xa hoi. thien ((van bac) OR (van bao)) xuc ((van hanh) or (ban hanh)) thai cuu tre".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xa hoi. thien ((van bac) OR (van bao)) xuc ((van hanh) or (ban hanh)) thai cuu tre*.