Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
doanh va » doan va, doanh tai, doanh cua
va doanh » van doanh, vay doanh, va danh
nang ma » tang ma, sang ma, mang may
van cac » van hac, van cau, van bac
cac xuc » cam xuc, cac nuoc, chat xuc
tu sach » su sach, te sach, tu cach
xuc va » duc va, tuc va, luc va
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky ((nang ma) OR (nang cao)) hoi. hieu van cac xuc va doanh va cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky ((nang ma) or (nang cao)) hoi. hieu van cac xuc va doanh va cua te~".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ky ((nang ma) or (nang cao)) hoi. hieu van cac xuc va doanh va cua te*.