Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
cua tre » cua te, cuu tre, cua triet
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
va cua » va chua, via cua, ca cua
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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

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