Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
va doanh » van doanh, vay doanh, va danh
cham cuu » cap cuu, chat cua
cham luc » cham soc, nhan luc, chat lua
van cua » vang cua, ban cua, dan cua
sach ky » sac ky, sach y, sach kem
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
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: thu ((sach ky) or (sach ty)) nang ma hoi. hieu ve ((cham luc) OR (cham cuu)) va doanh van cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang ma hoi. hieu ve ((cham luc) OR (cham cuu)) va doanh van cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach ty)) nang ma hoi. hieu ve ((cham luc) OR (cham cuu)) va doanh van cua te*".