Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
doanh va » doan va, doanh tai, doanh cua
va doanh » van doanh, vay doanh, va danh
tu sach » su sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
ve cac » va cac, vien cac
va cua » va chua, via cua, ca cua
ve cam » ve cham, va cam, ve cai
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu
lo va » lo van, lao va, ly va

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: ((tu sach) OR (thu sach)) ty nang ma hoi. hieu ((ve cam) OR (ve cac)) lo va doanh va cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ty nang ma hoi. hieu ((ve cam) or (ve cac)) lo va doanh va cua te~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ty nang ma hoi. hieu ((ve cam) or (ve cac)) lo va doanh va cua te*.