Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van hang » van khang, van hoang, van thang
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (su sach)) ky nang xa hoi. ((hieu ve) or (hieu van)) cam xuc van hang va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang xa hoi. ((hieu ve) OR (hieu van)) cam xuc van hang va cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang xa hoi. ((hieu ve) or (hieu van)) cam xuc van hang va cua tre*.