Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
va lang » va nang, hoa lang
xuc van » duc van, luc van, vuc van
v lang » o lang, _ lang, van lang
va cai » va bai, va dai, va cao
vi cua » vai cua, di cua
cua te » cua tu

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 ((v lang) or (va lang)) xa hoi. hieu ((va cai) or (va cac)) xuc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v lang) OR (va lang)) xa hoi. hieu ((va cai) OR (va cac)) xuc van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: toc sach ((v lang) or (va lang)) xa hoi. hieu ((va cai) or (va cac)) xuc van hanh vi cua te*.