Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cay phoi » cap phoi, tay hoi, cay cho
cau treo » cau theo, cau tren, cau triet
xay hoi » xa hoi, tay hoi, gay thoi
hieu ca » hieu cac, hieu cua, hieu va
sach ky » sac ky, sach y, sach ty
dan vat » dang vat, van vat, dan va
cuu tre » cua tre, cau tren
thu ca » thu cua, thu ha, thu ba
ca dan » cac dan, ca dao
ca nam » cua nam, cai nam, ha nam

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 ky nang ((xay hoi) OR (cay phoi)). hieu ca nam thu ca dan vat ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang ((xay hoi) OR (cay phoi)). hieu ca nam thu ca dan vat ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky nang ((xay hoi) OR (cay phoi)). hieu ca nam thu ca dan vat ((cuu tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang ((xay hoi) OR (cay phoi)). hieu ca nam thu ca dan vat ((cuu tre) or (cau treo))*.