Perhaps you should try some spelling variations:
te sach » toc sach
cac ban » cac dan, cac van, can ban
cuc ban » cua ban, cuu ban, duc ban
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
vi cuu » vi luu, vinh cuu
ve cam » ve cham, ve cac, va cam
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: ((te sach) or (su sach)) ky nang x hoi. hieu ve cam ((cuc ban) OR (cac ban)) hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ky nang x hoi. hieu ve cam ((cuc ban) OR (cac ban)) hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (su sach)) ky nang x hoi. hieu ve cam ((cuc ban) OR (cac ban)) hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) ky nang x hoi. hieu ve cam ((cuc ban) OR (cac ban)) hanh vi cuu tre*.