Perhaps you should try some spelling variations:
dao nang » cao nang, dai nang, dao nung
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
xuc ban » cuc ban, quoc ban, xuat ban
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
da nang » cam nang, kha nang, cao nang
va dao » ca dao
vi cua » vai cua, di cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((dao nang) or (da nang)) mai hoi. hieu va dao ((xuc ban) OR (duc ban)) hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((dao nang) OR (da nang)) mai hoi. hieu va dao ((xuc ban) OR (duc ban)) hanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((dao nang) or (da nang)) mai hoi. hieu va dao ((xuc ban) OR (duc ban)) hanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ((dao nang) or (da nang)) mai hoi. hieu va dao ((xuc ban) OR (duc ban)) hanh vi cua tu*.