Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » hieu qua
xuc ban » duc ban, cuc ban, quoc ban
vai cua » dai cua, hai cua, lai cua
vi cua » di cua

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