Perhaps you should try some spelling variations:
su sach » so sach, vu sach
va hanh » van hanh, va thanh, ban hanh
hai cua » thai cua, dai cua, hoi cua
va danh » va dinh, va dan, dia danh
sach ky » sac ky, sach y, sach ty
van hai » van ha, van chat, van hanh
van hac » van hoc, van ha, van chat
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang xa hoi. hieu ((van hac) or (van hai)) xuc ((va hanh) OR (va danh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ((van hac) OR (van hai)) xuc ((va hanh) OR (va danh)) hai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ((van hac) or (van hai)) xuc ((va hanh) OR (va danh)) hai cua tre*".