Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
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 hac » van hoc, van ha, van hai
van bao » van ban, van dao
va hanh » va thanh, va danh, ban hanh
cuc tre » duc tre, cua tre, cuu tre

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