Perhaps you should try some spelling variations:
doanh cua » doanh luan
thu sach » thuat sach, thuoc sach, thu hoach
cua cua » cua chua, ca cua, qua cua
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
tu sach » su sach, te sach, tu cach
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va

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) or (tu sach)) ty nang ma hoa. hieu va cac ((xuc va) or (luc va)) doanh cua cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ty nang ma hoa. hieu va cac ((xuc va) OR (luc va)) doanh cua cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ty nang ma hoa. hieu va cac ((xuc va) or (luc va)) doanh cua cua tre*.