Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
thu sach » tu sach, thuat sach, thuoc sach
nang ma » tang ma, sang ma, nang cao
van cua » vang cua, ban cua, dan cua
sach ky » sac ky, sach y, sach ty
xuc va » tuc va, luc va, xac va
cua te » cua tu
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai
ma hoi » mai hoi, xa hoi, ma hoa

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