Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
cham duc » pham duc, cham soc, pham duy
van chat » cao chat
sach thu » sach thue, sach thieu, sach tham
van cua » vang cua, ban cua, dan cua
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van

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 thu ((nang xa) OR (nang x)) hoi. hieu ve cham duc van doanh ((van cua) or (van chat)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu ((nang xa) OR (nang x)) hoi. hieu ve cham duc van doanh ((van cua) OR (van chat)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu ((nang xa) OR (nang x)) hoi. hieu ve cham duc van doanh ((van cua) or (van chat)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach thu ((nang xa) OR (nang x)) hoi. hieu ve cham duc van doanh ((van cua) or (van chat)) tre*.