Perhaps you should try some spelling variations:
voi doanh » von doanh, tri doanh, hoa doanh
doanh van » doan van, doanh va, doanh ban
tu sach » thu sach, su sach, te sach
cua tre » cuu tre, cua triet, dua tren
luc voi » luc moi, luc doi, luc khoi
va cham » va chat, va tham
ve cham » ve chat, vu cham, ve chim
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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