Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
van thanh » van tuan
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
tru nang » tra nang, tri nang, truc nano
nam xuc » cam xuc, nam xua, nam thuc
tu nang » tu nong, tu nano, tu lang
cuu tre » cua tre, cau tren, cau treo
va cuu » va cau, va chu, va huu

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 ((tu nang) or (tru nang)) xa hoi. hieu van nam xuc ((van thanh) OR (ban thanh)) va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((tu nang) OR (tru nang)) xa hoi. hieu van nam xuc ((van thanh) OR (ban thanh)) va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((tu nang) or (tru nang)) xa hoi. hieu van nam xuc ((van thanh) OR (ban thanh)) va cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((tu nang) or (tru nang)) xa hoi. hieu van nam xuc ((van thanh) OR (ban thanh)) va cuu tre*.