Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham sac » cham soc, pham sach, cap sac
vu sach » vu bach, su sach, vu khach
sac van » cac van, san van, sat van
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
lang ha » long ha
lang xa » dang xay, lang van
di cua » dai cua, doi cua, de cua
le cua » ly 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 y ((lang xa) or (lang ha)) hoi. hieu vu cham sac van hanh ((di cua) or (le cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y ((lang xa) OR (lang ha)) hoi. hieu vu cham sac van hanh ((di cua) OR (le cua)) tre.
• Adding a wildcard symbol may retrieve word variants: vu sach y ((lang xa) or (lang ha)) hoi. hieu vu cham sac van hanh ((di cua) or (le cua)) tre*.