Perhaps you should try some spelling variations:
ban hanh » ban hang
thu sach » tu sach, thuat sach, thuoc sach
chu bang » thu bang, chuc nang, chu quang
phu lang » phap lang, phu khang, phu luong
hien tu » khien tu, dien tu
via van » va van, gian van, giay van
ha hoi » hoa hoi, ha noi, xa hoi
nam so » nam sao, nam bo
so ban » sao ban, so bang, co ban
via va » vua va, gia va, dia va
tu nam » su nam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((chu bang) or (phu lang)) ha hoi. hien tu nam so ban hanh ((via va) OR (via van)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((chu bang) OR (phu lang)) ha hoi. hien tu nam so ban hanh ((via va) OR (via van)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((chu bang) or (phu lang)) ha hoi. hien tu nam so ban hanh ((via va) OR (via van)) triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ((chu bang) or (phu lang)) ha hoi. hien tu nam so ban hanh ((via va) OR (via van)) triet*.