Perhaps you should try some spelling variations:
cua quoc » cua nuoc, cua thuoc
thanh ve » hanh ve, thanh va, thanh vien
thu sach » tu sach, thuat sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
vuc van » duc van, luc van, thuc van
xuc van » duc van, luc van, xuc ban
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
ve cua » le cua, de cua, te cua
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu sach)) y nang mai hoi. hieu va cao ((xuc van) OR (vuc van)) thanh ve cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) y nang mai hoi. hieu va cao ((xuc van) OR (vuc van)) thanh ve cua quoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu sach)) y nang mai hoi. hieu va cao ((xuc van) OR (vuc van)) thanh ve cua quoc".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) y nang mai hoi. hieu va cao ((xuc van) OR (vuc van)) thanh ve cua quoc*.