Perhaps you should try some spelling variations:
te sach » toc sach
cuc ban » cua ban, cac ban, cuu ban
hieu ve » hieu va, hieu van
nang so » nang som, nang co, nang ho
vu sach » vu bach, su sach, vu khach
cuu tre » cua tre, cau tren, cau treo
so hai » son hai, su hai, so ha
ve cac » va cac, vien cac
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (vu sach)) ky nang so hai. hieu ve cac ((cuc ban) or (cac dan)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (vu sach)) ky nang so hai. hieu ve cac ((cuc ban) OR (cac dan)) hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (vu sach)) ky nang so hai. hieu ve cac ((cuc ban) or (cac dan)) hanh vi cuu tre*.