Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
tuc va » thuc va, truc va, tuc xa
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 ((ky lang) or (ky dang)) xa hoi. ((hieu ve) or (hieu van)) cam tuc va danh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky dang)) xa hoi. ((hieu ve) OR (hieu van)) cam tuc va danh va cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) or (ky dang)) xa hoi. ((hieu ve) or (hieu van)) cam tuc va danh va cua tre*.