Perhaps you should try some spelling variations:
doanh cao » doanh co, doanh bao, doanh cho
thu sach » tu sach, thuat sach, thuoc sach
doanh ca » doanh cua, doanh va, danh ca
cham lo » cham o, cam lo, cham soc
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
lo va » lo van, lao va, ly va

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