Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
de cua » le cua, dieu cua
te cua » tue cua, le 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 sang ma hoi. hieu ve cac luc ((van hanh) or (van minh)) ((de cua) OR (te cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky sang ma hoi. hieu ve cac luc ((van hanh) OR (van minh)) ((de cua) OR (te cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky sang ma hoi. hieu ve cac luc ((van hanh) or (van minh)) ((de cua) OR (te cua)) tre*".