Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua quoc » cua nuoc, cua thuoc
thu sach » thuat sach, thu hoach, khau sach
ban hanh » ban hang
nang mai » nang ma, nang tai, lang mai
hanh va » hang va, hanh vi
xuc ban » duc ban, cuc ban, quoc ban
hieu ve » hieu va, hieu van
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
ve cam » ve cham, ve cac, va cam
y nang » ky nang, ly nang, v nang
va cua » va chua, via cua, ca 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) or (((thu sach) OR (thuoc sach)))) y nang mai hoi. hieu ve cam xuc ban hanh va cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((thu sach) OR (thuoc sach)))) y nang mai hoi. hieu ve cam xuc ban hanh va cua quoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((thu sach) OR (thuoc sach)))) y nang mai hoi. hieu ve cam xuc ban hanh va cua quoc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((thu sach) OR (thuoc sach)))) y nang mai hoi. hieu ve cam xuc ban hanh va cua quoc*.