Perhaps you should try some spelling variations:
dau luan » dan luan, dat luan, khau luan
ban hanh » ban hang
hanh moi » thanh moi, hanh noi, hanh mot
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
dau luc » cau luc, dau nuoc, dau luot
moi cua » hoi cua, doi cua, moi quan
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang xa hoi. ((hieu va) or (lieu va)) ((dau luc) OR (dau luan)) ban hanh moi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang xa hoi. ((hieu va) OR (lieu va)) ((dau luc) OR (dau luan)) ban hanh moi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang xa hoi. ((hieu va) or (lieu va)) ((dau luc) OR (dau luan)) ban hanh moi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang xa hoi. ((hieu va) or (lieu va)) ((dau luc) OR (dau luan)) ban hanh moi cua tre*.