Perhaps you should try some spelling variations:
tuan khuc » thuan thuc, tuan thu, luan thuc
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
tuan xuc » quang xuc, toan xac, tue xuc
dinh dai » dinh dat, sinh dai, dinh dao
ty nang » ty xang, ty hang, ly nang
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet

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 (ky nang)) xa hoi. hieu van ((tuan xuc) OR (tuan khuc)) va dinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty nang) OR (ky nang)) xa hoi. hieu van ((tuan xuc) OR (tuan khuc)) va dinh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty nang) or (ky nang)) xa hoi. hieu van ((tuan xuc) OR (tuan khuc)) va dinh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty nang) or (ky nang)) xa hoi. hieu van ((tuan xuc) OR (tuan khuc)) va dinh dai cua tre*.