Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
va doanh » van doanh, vay doanh, va danh
te sach » toc sach
truc va » thuc va, thuc vat, trung va
van bao » van ban, van dao
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
van ba » van ban, van bac, van bau
ma hoi » mai hoi, xa hoi, ma hoa
cu tre » cu tren, cuu tre, cu tri

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ma hoi. hieu ((van ba) or (van bao)) truc va doanh van ((cu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoi. hieu ((van ba) OR (van bao)) truc va doanh van ((cu tre) OR (cua tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoi. hieu ((van ba) or (van bao)) truc va doanh van ((cu tre) OR (cua tre))*".