Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cao treo » cau treo, cho tre, bao tro
ky tang » ky nang, ky dang, kho tang
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, tay lang
thuc va » thuc vat, thuc dan, thuc day
dan tai » van tai, dan thi, han tai
tai cao » thai cao, tao cao, tai sao
va nam » van nam, va nay
va dan » ca dan, va dao, va dau

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 lang) OR (ky tang)) van hoi. hieu ((va nam) or (ha nam)) thuc va dan tai cao treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky lang) OR (ky tang)) van hoi. hieu ((va nam) OR (ha nam)) thuc va dan tai cao treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky lang) OR (ky tang)) van hoi. hieu ((va nam) or (ha nam)) thuc va dan tai cao treo".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky lang) OR (ky tang)) van hoi. hieu ((va nam) or (ha nam)) thuc va dan tai cao treo*.