Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, va danh
doanh va » doan va, doanh tai, doanh cua
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
ve cham » va cham, ve chat, ve chim
vu cham » va cham, vu kham, tu cham
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va, loc va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ma hoi. hieu ((ve cham) or (vu cham)) luc va doanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu ((ve cham) OR (vu cham)) luc va doanh va cua tre*.