Perhaps you should try some spelling variations:
ban hang » ngan hang
cham luc » cham soc, nhan luc, cham cuu
cua tre » cua te, cuu tre, cua triet
va dinh » van dinh, va kinh, va tinh
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
dang ha » dong ha, dung ha, lang ha
dang xa » dang xay, lang xa, dang va
cai ky » cao ky, cac ky, cam ky
di cua » dai cua, doi cua, de cua
tu cai » tu cac, tu can, tu bai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cai ky ((dang xa) OR (dang ha)) hoi. hieu ve cham luc ((ban hang) or (va dinh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky ((dang xa) OR (dang ha)) hoi. hieu ve cham luc ((ban hang) OR (va dinh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky ((dang xa) OR (dang ha)) hoi. hieu ve cham luc ((ban hang) or (va dinh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cai ky ((dang xa) OR (dang ha)) hoi. hieu ve cham luc ((ban hang) or (va dinh)) di cua tre*.