Perhaps you should try some spelling variations:
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
cac luc » cau luc, cac nuoc, cac cuoc
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
de cua » le cua, te cua, dieu 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) OR (coc luc)) ((ban hanh) or (van minh)) de 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) OR (coc luc)) ((ban hanh) OR (van minh)) de 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) OR (coc luc)) ((ban hanh) or (van minh)) de cua tre*".