Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban hang » ngan hang
hieu van » hieu va, thien van, lieu va
tai cua » thai cua, tai cuc, tri cua
cam cuc » cam xuc, cham cuu, pham cuc
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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