Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau triet
hieu ve » hieu va, hieu van
vai cau » va cau, van cau, vai cac
cam tuc » cam xuc, cam tu, dam thuc
y lang » o lang, tay lang, yen lang
_ lang » o lang, _ land

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 ((y lang) or (_ lang)) xa hoi. hieu ve ((cam tuc) or (nam thuc)) van hanh vai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((y lang) OR (_ lang)) xa hoi. hieu ve ((cam tuc) OR (nam thuc)) van hanh vai cau treo.
• Adding a wildcard symbol may retrieve word variants: toc sach ((y lang) or (_ lang)) xa hoi. hieu ve ((cam tuc) or (nam thuc)) van hanh vai cau treo*.