Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
hieu ve » hieu va, hieu van
ky hang » ky nang, ly hang, ky dang
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
va hoi » xa hoi, va hoc, va hoa
de cua » dieu cua
te cua » tue cua
le cua » ly cua
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky hang va hoi. hieu ve cac luc van hanh ((((de cua) or (te cua))) or (le cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky hang va hoi. hieu ve cac luc van hanh ((((de cua) OR (te cua))) OR (le cua)) tre.
• Adding a wildcard symbol may retrieve word variants: te sac ky hang va hoi. hieu ve cac luc van hanh ((((de cua) or (te cua))) or (le cua)) tre*.