Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
van tuan » van quan, van ban, anh tuan
tuan xuc » quang xuc, tuan khuc, toan xac
dinh doi » dinh moi, tinh doi, dinh toi
ty nang » ty hang, ly nang, ty nong
va dinh » van dinh, va kinh, va tinh
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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

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