Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
van hanh » van thanh, ban hanh, van anh
cham sac » cham soc, pham sach, cap sac
vu sach » vu bach, su sach
hanh di » hanh vi, hanh de, hang di
sac van » cac van, san van, sat van
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
lang xa » dang xay, lang van
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (vu khach)) y ((lang xa) or (lang ha)) hoi. hieu vu cham sac van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) y ((lang xa) OR (lang ha)) hoi. hieu vu cham sac van hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) y ((lang xa) or (lang ha)) hoi. hieu vu cham sac van hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) y ((lang xa) or (lang ha)) hoi. hieu vu cham sac van hanh di cua tre*.